[Bug] Improve Managed Identity Source Detection Logging for Debugging

[gladjohn]

Library version used

Latest

.NET version

net 8

Scenario

ManagedIdentityClient - managed identity

Is this a new or an existing app?

This is a new app or experiment

Issue description and reproduction steps

improve logs for debugging msi source detection

Relevant code snippets

Expected behavior

improve logs for debugging msi source detection

Identity provider

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

Regression

No response

Solution and workarounds

No response

[bgavrilMS]

Why is this a bug? Who is impacted?

[gladjohn]

based on an internal investigation we found that the logs were not very helpful given that we changed the source detection logic. Earlier on we did a Source.TryCreate() and each source was executed sequentially and logs were there. Now we have a helper method that checks environment variables, and this is how MSAL responds with now

with the proposed fix we will do this