Bug description

I am an Azure costumer. I can't use MSAL to generate an access token for the scope of my app reg using my managed identity.

I have this setup:

• I deployed an Azure function app that is validating access token of an Application registration. It checks that the Client has the correct role.
• I have a compute instance that is assigned a Managed identity. I want to send a HTTP request to my azure function with an access token generated for my Managed Identity.

It might be related to #58

To Reproduce

1. Create an app reg with a custom role
2. Create a managed identity
3. Assign the custom role to the managed identity
4. Create a compute instance and assigned it the managed identity
5. In the compute instance run:

from azure.identity import ManagedIdentityCredential
cred = ManagedIdentityCredential(client_id="<managed-identity-client-id>")
token = cred.get_token("api://<app-reg-client-id>/.default")

The code will run indefinitely

Expected behavior
After running token = cred.get_token("api://<app-reg-client-id>/.default") the token should be generated

What you see instead

Code is still running and no token is generated.

The MSAL Python version you are using
1.21.0