409 Request_MultipleObjectsWithSameKeyValue when updating IssuerUri

[frhuamzn]

Describe the bug

Update-MgBetaDomainFederationConfiguration returns 409 Request_MultipleObjectsWithSameKeyValue when setting an IssuerUri that is already used by another domain's federation configuration in the same tenant. This uniqueness constraint on IssuerUri is not documented on the API reference page.

Expected behavior

The API documentation does not mention that IssuerUri must be globally unique across all federated domains in a tenant. This constraint should be documented.

How to reproduce

1. Successfully create federation config on contoso.com with IssuerUri A.

2. Attempt to update it to use the same IssuerUri already assigned to fabrikam.com:

   Update-MgBetaDomainFederationConfiguration -DomainId "contoso.com" -InternalDomainFederationId $fedId
   -IssuerUri "https://idp.example.com/shared-issuer"

Result

409 Request_MultipleObjectsWithSameKeyValue

SDK Version

2.37.0

Latest version known to work for scenario above?

N/A

Known Workarounds

Use a new Issuer URI

Debug output

Click to expand log

``` 409 Request_MultipleObjectsWithSameKeyValue

</details>


### Configuration

N/A

### Other information

N/A