fix(Accounts): handle management.azure.com as ARM endpoint in AccessTokenAuthenticator

[khang-11]

Description

Fixes #28028

Get-AzAccessToken -ResourceUrl "https://management.azure.com/" fails when signed in via Connect-AzAccount -AccessToken, even though the stored ARM access token is valid for that audience.

Root Cause

AccessTokenAuthenticator maps the incoming resourceId to one of the pre-stored tokens. The ARM token branch only matched resource IDs equivalent to ActiveDirectoryServiceEndpointResourceId (i.e. https://management.core.windows.net/). When the user passes https://management.azure.com/ (the ResourceManager endpoint URL), none of the conditions matched and the authenticator threw:

[AccessTokenAuthenticator] failed to retrieve access token for resource 'https://management.azure.com/'

Both https://management.core.windows.net/ and https://management.azure.com/ are valid audiences for the same ARM access token, so the fix is to also recognise the ResourceManager endpoint URL in the ARM token branch.

Fix

In AccessTokenAuthenticator.cs, one extra condition is added to the ARM token branch:

resourceId.EqualsInsensitively(environment.GetEndpoint(AzureEnvironment.Endpoint.ResourceManager))

Tests

A new test class AccessTokenAuthenticatorTests is added with 6 unit tests:

Test	Purpose
ReturnsArmToken_WhenResourceIsManagementAzureCom	Regression test for the bug fix
ReturnsArmToken_WhenResourceIsManagementCoreWindowsNet	Existing working case still passes
ReturnsKeyVaultToken_WhenResourceIsKeyVaultEndpoint	KeyVault token routing unchanged
ReturnsGraphToken_WhenResourceIsGraphEndpoint	Graph token routing unchanged
ThrowsInvalidOperationException_WhenResourceIsUnsupported	Error path unchanged
CanAuthenticate_ReturnsTrueForAccessTokenParameters	Selector method works

Checklist

• Added tests to cover the fix
• Existing tests pass (no regressions introduced)

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[Copilot]

Pull request overview

Fixes an Az.Accounts access-token-login edge case where Get-AzAccessToken -ResourceUrl https://management.azure.com/ failed because AccessTokenAuthenticator didn’t recognize the ARM ResourceManager endpoint URL as a valid audience for the stored ARM token.

Changes:

• Extend AccessTokenAuthenticator ARM token routing to also match the environment’s ResourceManager endpoint URL.
• Add new AccessTokenAuthenticatorTests unit tests covering ARM/Graph/KeyVault routing, unsupported resource behavior, and CanAuthenticate.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/Accounts/Authenticators/AccessTokenAuthenticator.cs	Adds ARM token matching for environment.GetEndpoint(AzureEnvironment.Endpoint.ResourceManager) to support management.azure.com audience.
src/Accounts/Authentication.Test/AuthenticatorsTest/AccessTokenAuthenticatorTests.cs	Introduces unit tests validating token routing behavior and regression coverage for management.azure.com.

[Copilot]

The test class constructor takes an ITestOutputHelper parameter but doesn't use it. Other authenticator test classes in this project store the output helper (e.g., ManagedServiceIdentityAuthenticatorTests) to avoid analyzer warnings about unused parameters. Consider either assigning it to a field/property or removing the parameter (and corresponding using) if it's not needed.

Suggested change

	private readonly IAzureEnvironment _azureCloud = AzureEnvironment.PublicEnvironments["AzureCloud"];
	public AccessTokenAuthenticatorTests(ITestOutputHelper output)
	{
	private readonly ITestOutputHelper _output;
	private readonly IAzureEnvironment _azureCloud = AzureEnvironment.PublicEnvironments["AzureCloud"];
	public AccessTokenAuthenticatorTests(ITestOutputHelper output)
	{
	_output = output;

[Copilot]

The XML summary says CanAuthenticate "returns true only for AccessTokenParameters", but the test currently only asserts the true case. Either add a negative assertion (e.g., with a different AuthenticationParameters type) or adjust the summary to avoid implying behavior that isn't being validated.

[khang-11]

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