Unable to Update Application-Gateway Backend Address Pool 

### Describe the bug

When attempting to update the Backend Address Pool of an Application Gateway with a new IP I am receiving an unexpected error.   I am able perform the operation using the PowerShell module, but my organization leverages Azure-CLI for its CI operations

### Related command

`az network application-gateway address-pool update --gateway-name "<application-gateway-name>" --name "<backend-address-pool-name>" --resource-group "<resource-group-name>" --servers "<private-ip-address>"`

---
The following command also gives the same error: 

`az network application-gateway address-pool update --gateway-name "<application-gateway-name>" --name "<backend-address-pool-name>" --resource-group "<resource-group-name>" --add backendAddresses ipAddress= "<private-ip-address>"`

### Errors
```
The command failed with an unexpected error. Here is the traceback:
Missing a required field in request content: selector
Traceback (most recent call last):
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 663, in execute
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 708, in _run_job
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 1000, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 108, in result
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/core/tracing/decorator.py", line 76, in wrapper_use_tracer
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 130, in wait
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 83, in _start
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1098, in _execute_operations
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1233, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 318, in make_request
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1318, in content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 188, in serialize_content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 433, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 144, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 183, in processor
```
### Issue script & Debug output
```
DEBUG: cli.knack.cli: Command arguments: ['network', 'application-gateway', 'address-pool', 'update', '--gateway-name', '[REDACTED]', '--name', '[REDACTED]', '--resource-group', '[REDACTED]', '--servers', '[REDACTED]', '--debug']
DEBUG: cli.knack.cli: __init__ debug log:
Cannot enable color.
DEBUG: cli.knack.cli: Event: Cli.PreExecute []
DEBUG: cli.knack.cli: Event: CommandParser.OnGlobalArgumentsCreate [<function CLILogging.on_global_arguments at 0x0000014B02E9B560>, <function OutputProducer.on_global_arguments at 0x0000014B03025C60>, <function CLIQuery.on_global_arguments at 0x0000014B030537E0>]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableCreate []
DEBUG: cli.azure.cli.core: Modules found from index for 'network': ['azure.cli.command_modules.network', 'azure.cli.command_modules.privatedns']
DEBUG: cli.azure.cli.core: Loading command modules:
DEBUG: cli.azure.cli.core: Name                  Load Time    Groups  Commands
DEBUG: cli.azure.cli.core: network                   0.277       117       545
DEBUG: cli.azure.cli.core: privatedns                0.015        14        60
DEBUG: cli.azure.cli.core: Total (2)                 0.292       131       605
DEBUG: cli.azure.cli.core: These extensions are not installed and will be skipped: ['azext_ai_examples', 'azext_next']
DEBUG: cli.azure.cli.core: Loading extensions:
DEBUG: cli.azure.cli.core: Name                  Load Time    Groups  Commands  Directory
DEBUG: cli.azure.cli.core: Total (0)                 0.000         0         0  
DEBUG: cli.azure.cli.core: Loaded 130 groups, 605 commands.
DEBUG: cli.azure.cli.core: Found a match in the command table.
DEBUG: cli.azure.cli.core: Raw command  : network application-gateway address-pool update
DEBUG: cli.azure.cli.core: Command table: network application-gateway address-pool update
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableTruncate [<function AzCliLogging.init_command_file_logging at 0x0000014B05F7A160>]
DEBUG: cli.azure.cli.core.azlogging: metadata file logging enabled - writing logs to 'C:\Users\[REDACTED]\.azure\commands\2024-02-01.11-37-49.network_application-gateway_address-pool_update.24588.log'.
INFO: az_command_data_logger: command args: network application-gateway address-pool update --gateway-name {} --name {} --resource-group {} --servers {} --debug
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreArgumentLoad [<function register_global_subscription_argument.<locals>.add_subscription_parameter at 0x0000014B05FAE480>]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPostArgumentLoad []
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPostCommandTableCreate [<function register_ids_argument.<locals>.add_ids_arguments at 0x0000014B05FD8540>, <function register_cache_arguments.<locals>.add_cache_arguments at 0x0000014B05FD8680>]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnCommandTableLoaded []
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreParseArgs []
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPostParseArgs [<function OutputProducer.handle_output_argument at 0x0000014B03025D00>, <function CLIQuery.handle_query_parameter at 0x0000014B03053880>, <function register_ids_argument.<locals>.parse_ids_arguments at 0x0000014B05FD85E0>]
DEBUG: cli.azure.cli.core.auth.persistence: build_persistence: location='C:\\Users\\[REDACTED]\\.azure\\msal_token_cache.bin', encrypt=True
DEBUG: cli.azure.cli.core.auth.binary_cache: load: C:\Users\[REDACTED]\.azure\msal_http_cache.bin
DEBUG: urllib3.util.retry: Converted retries value: 1 -> Retry(total=1, connect=None, read=None, redirect=None, status=None)
DEBUG: msal.authority: openid_config = {'token_endpoint': 'https://login.microsoftonline.us/[REDACTED]/oauth2/v2.0/token', 'token_endpoint_auth_methods_supported': ['client_secret_post', 'private_key_jwt', 'client_secret_basic'], 'jwks_uri': 'https://login.microsoftonline.us/[REDACTED]/discovery/v2.0/keys', 'response_modes_supported': ['query', 'fragment', 'form_post'], 'subject_types_supported': ['pairwise'], 'id_token_signing_alg_values_supported': ['RS256'], 'response_types_supported': ['code', 'id_token', 'code id_token', 'id_token token'], 'scopes_supported': ['openid', 'profile', 'email', 'offline_access'], 'issuer': 'https://login.microsoftonline.us/[REDACTED]/v2.0', 'request_uri_parameter_supported': False, 'userinfo_endpoint': 'https://graph.microsoft.us/oidc/userinfo', 'authorization_endpoint': 'https://login.microsoftonline.us/[REDACTED]/oauth2/v2.0/authorize', 'device_authorization_endpoint': 'https://login.microsoftonline.us/[REDACTED]/oauth2/v2.0/devicecode', 'http_logout_supported': True, 'frontchannel_logout_supported': True, 'end_session_endpoint': 'https://login.microsoftonline.us/[REDACTED]/oauth2/v2.0/logout', 'claims_supported': ['sub', 'iss', 'cloud_instance_name', 'cloud_instance_host_name', 'cloud_graph_host_name', 'msgraph_host', 'aud', 'exp', 'iat', 'auth_time', 'acr', 'nonce', 'preferred_username', 'name', 'tid', 'ver', 'at_hash', 'c_hash', 'email'], 'kerberos_endpoint': 'https://login.microsoftonline.us/[REDACTED]/kerberos', 'tenant_region_scope': 'USGov', 'cloud_instance_name': 'microsoftonline.us', 'cloud_graph_host_name': 'graph.microsoftazure.us', 'msgraph_host': 'graph.microsoft.us', 'rbac_url': 'https://pasff.usgovcloudapi.net'}
DEBUG: msal.application: Broker enabled? False
DEBUG: cli.azure.cli.core.auth.credential_adaptor: CredentialAdaptor.get_token: scopes=('https://management.core.usgovcloudapi.net//.default',), kwargs={}
DEBUG: cli.azure.cli.core.auth.msal_authentication: UserCredential.get_token: scopes=('https://management.core.usgovcloudapi.net//.default',), claims=None, kwargs={}
DEBUG: msal.application: Cache hit an AT
DEBUG: msal.telemetry: Generate or reuse correlation_id: d4b99cbe-b1f4-4087-a13e-9ca7b4d6906f
DEBUG: cli.azure.cli.core.sdk.policies: Request URL: 'https://management.usgovcloudapi.net/subscriptions/[REDACTED]?api-version=2022-05-01'
DEBUG: cli.azure.cli.core.sdk.policies: Request method: 'GET'
DEBUG: cli.azure.cli.core.sdk.policies: Request headers:
DEBUG: cli.azure.cli.core.sdk.policies:     'Accept': 'application/json'
DEBUG: cli.azure.cli.core.sdk.policies:     'x-ms-client-request-id': '3c682f4d-c120-11ee-89be-ac50defeef3e'
DEBUG: cli.azure.cli.core.sdk.policies:     'CommandName': 'network application-gateway address-pool update'
DEBUG: cli.azure.cli.core.sdk.policies:     'ParameterSetName': '--gateway-name --name --resource-group --servers --debug'
DEBUG: cli.azure.cli.core.sdk.policies:     'User-Agent': 'AZURECLI/2.56.0 (MSI) (AAZ) azsdk-python-core/1.28.0 Python/3.11.5 (Windows-10-10.0.22621-SP0)'
DEBUG: cli.azure.cli.core.sdk.policies:     'Authorization': '*****'
DEBUG: cli.azure.cli.core.sdk.policies: Request body:
DEBUG: cli.azure.cli.core.sdk.policies: This request has no body
DEBUG: urllib3.connectionpool: Starting new HTTPS connection (1): management.usgovcloudapi.net:443
DEBUG: urllib3.connectionpool: https://management.usgovcloudapi.net:443 "GET /subscriptions/[REDACTED]?api-version=2022-05-01 HTTP/1.1" 200 None
DEBUG: cli.azure.cli.core.sdk.policies: Response status: 200
DEBUG: cli.azure.cli.core.sdk.policies: Response headers:
DEBUG: cli.azure.cli.core.sdk.policies:     'Cache-Control': 'no-cache'
DEBUG: cli.azure.cli.core.sdk.policies:     'Pragma': 'no-cache'
DEBUG: cli.azure.cli.core.sdk.policies:     'Transfer-Encoding': 'chunked'
DEBUG: cli.azure.cli.core.sdk.policies:     'Content-Type': 'application/json; charset=utf-8'
DEBUG: cli.azure.cli.core.sdk.policies:     'Content-Encoding': 'gzip'
DEBUG: cli.azure.cli.core.sdk.policies:     'Expires': '-1'
DEBUG: cli.azure.cli.core.sdk.policies:     'ETag': 'W/"3375029f-1353-4174-8bf5-c8ca9642c86f"'
DEBUG: cli.azure.cli.core.sdk.policies:     'Vary': 'Accept-Encoding'
DEBUG: cli.azure.cli.core.sdk.policies:     'x-ms-request-id': '162f0cfa-ec9d-43f5-a2e5-ccee1a882165'
DEBUG: cli.azure.cli.core.sdk.policies:     'x-ms-correlation-request-id': 'a82f65da-1390-4049-a6a6-ddb4da49d131'
DEBUG: cli.azure.cli.core.sdk.policies:     'x-ms-arm-service-request-id': '08e18c49-e62d-468c-ae8b-f56d0bc672c9'
DEBUG: cli.azure.cli.core.sdk.policies:     'Strict-Transport-Security': 'max-age=31536000; includeSubDomains'
DEBUG: cli.azure.cli.core.sdk.policies:     'Server': 'Microsoft-HTTPAPI/2.0, Microsoft-HTTPAPI/2.0'
DEBUG: cli.azure.cli.core.sdk.policies:     'x-ms-ratelimit-remaining-subscription-reads': '14996'
DEBUG: cli.azure.cli.core.sdk.policies:     'x-ms-routing-request-id': 'USGOVVIRGINIA:20240201T163750Z:a82f65da-1390-4049-a6a6-ddb4da49d131'
DEBUG: cli.azure.cli.core.sdk.policies:     'X-Content-Type-Options': 'nosniff'
DEBUG: cli.azure.cli.core.sdk.policies:     'Date': 'Thu, 01 Feb 2024 16:37:49 GMT'
DEBUG: cli.azure.cli.core.sdk.policies: Response content: 

[REDACTED]

DEBUG: cli.azure.cli.core.azclierror: Traceback (most recent call last):
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 663, in execute
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 708, in _run_job
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 1000, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 108, in result
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/core/tracing/decorator.py", line 76, in wrapper_use_tracer
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 130, in wait
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 83, in _start
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1098, in _execute_operations
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1233, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 318, in make_request
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1318, in content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 188, in serialize_content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 433, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 144, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 183, in processor
ValueError: Missing a required field in request content: selector

ERROR: cli.azure.cli.core.azclierror: The command failed with an unexpected error. Here is the traceback:
ERROR: az_command_data_logger: The command failed with an unexpected error. Here is the traceback:
ERROR: cli.azure.cli.core.azclierror: Missing a required field in request content: selector
Traceback (most recent call last):
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 663, in execute
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 708, in _run_job
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 1000, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 108, in result
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/core/tracing/decorator.py", line 76, in wrapper_use_tracer
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 130, in wait
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 83, in _start
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1098, in _execute_operations
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1233, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 318, in make_request
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1318, in content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 188, in serialize_content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 433, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 144, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 183, in processor
ValueError: Missing a required field in request content: selector
ERROR: az_command_data_logger: Missing a required field in request content: selector
Traceback (most recent call last):
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 663, in execute
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 708, in _run_job
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 1000, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 108, in result
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/core/tracing/decorator.py", line 76, in wrapper_use_tracer
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 130, in wait
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_poller.py", line 83, in _start
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1098, in _execute_operations
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1233, in __call__
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 318, in make_request
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure\cli\command_modules\network\aaz_compact\latest\network\application_gateway\address_pool\__cmds.py", line 1318, in content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 188, in serialize_content
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 133, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 433, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_field_value.py", line 144, in to_serialized_data
  File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/aaz/_operation.py", line 183, in processor
ValueError: Missing a required field in request content: selector
To check existing issues, please visit: https://github.com/Azure/azure-cli/issues
DEBUG: cli.knack.cli: Event: Cli.PostExecute [<function AzCliLogging.deinit_cmd_metadata_logging at 0x0000014B05F7A3E0>]
INFO: az_command_data_logger: exit code: 1
INFO: cli.__main__: Command ran in 1.556 seconds (init: 0.199, invoke: 1.357)
INFO: telemetry.main: Begin splitting cli events and extra events, total events: 1
INFO: telemetry.client: Accumulated 0 events. Flush the clients.
INFO: telemetry.main: Finish splitting cli events and extra events, cli events: 1
INFO: telemetry.save: Save telemetry record of length 7314 in cache
INFO: telemetry.main: Begin creating telemetry upload process.
INFO: telemetry.process: Creating upload process: "C:\Program Files\Microsoft SDKs\Azure\CLI2\python.exe C:\Program Files\Microsoft SDKs\Azure\CLI2\Lib\site-packages\azure\cli\telemetry\__init__.pyc C:\Users\[REDACTED]\.azure"
INFO: telemetry.process: Return from creating process
INFO: telemetry.main: Finish creating telemetry upload process.
```

### Expected behavior

Expected behavior would have been for the Backend Address to be updated and the new Address-Pool info being logged to the output, or failure with an error that gives more information. 

### Environment Summary

```
azure-cli                         2.56.0

core                              2.56.0
telemetry                          1.1.0

Extensions:
amg                                1.2.9

Dependencies:
msal                            1.24.0b2
azure-mgmt-resource             23.1.0b2
```

### Additional context

- Azure Cloud is the US Government Cloud
- Application Gateway is configured with both public and private Frontend IP addresses. 

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Unable to Update Application-Gateway Backend Address Pool #28289

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