[Bug] Unable to Authenticate with a User Assigned Managed Identity In Azure Function Apps

[saisrivathsa]

Library version used

Microsoft.Identity.Client (>= 4.70.0)

.NET version

8

Scenario

ManagedIdentityClient - managed identity

Is this a new or an existing app?

The app is in production, and I have upgraded to a new version of MSAL

Issue description and reproduction steps

We are seeing the following error while using the 4.70.0 version. At version 4.67.2 everything was working fine.

Exception: System.AggregateException: One or more errors occurred. (ManagedIdentityCredential authentication failed: [Managed Identity] Error Message: Unable to load the proper Managed Identity. Managed Identity Correlation ID: 70c95bc9-5985-4bf1-9b28-72a8e813e3cd Use this Correlation ID for further investigation.
See the troubleshooting guide for more information. https://aka.ms/azsdk/net/identity/managedidentitycredential/troubleshoot)
 ---> Azure.Identity.AuthenticationFailedException: ManagedIdentityCredential authentication failed: [Managed Identity] Error Message: Unable to load the proper Managed Identity. Managed Identity Correlation ID: 70c95bc9-5985-4bf1-9b28-72a8e813e3cd Use this Correlation ID for further investigation.
See the troubleshooting guide for more information. https://aka.ms/azsdk/net/identity/managedidentitycredential/troubleshoot
 ---> MSAL.NetCore.4.70.2.0.MsalServiceException:
	ErrorCode: managed_identity_request_failed

Relevant code snippets

Expected behavior

No response

Identity provider

Microsoft Entra ID (Work and School accounts and Personal Microsoft accounts)

Regression

4.67.2

Solution and workarounds

No response

[github-actions]

Here are some similar issues that might help you. Please check if they can solve your problem.

• [Bug] Unable to Authenticate Using MSI with a User Assigned Managed Identity In Azure Container App #5245
• [Bug] ManagedIdentityCredential authentication failed #5077

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Possible solution (Extracted from existing issue, might be incorrect; please verify carefully)

Revert back to MSAL version 4.67.0, as this version does not have the issue with ManagedIdentityCredential authentication failing.

Reference:

• [Bug] ManagedIdentityCredential authentication failed #5077 (comment)

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[saisrivathsa]

There seems to have been a bug on our end which was manifesting in this error. As we've found similar issue raised on GITHUB we've assumed the same might be effecting us. We've fixed that and are currently using the 4.70.0 version and everything is working as expected.

Apologies for the false alarm.