Django Microsoft Authentication Backend not succeeding on new deployments

I have an app deployed in many places and it uses Django Microsoft Authentication Backend. Starting yesterday when we deploy the app the auth is now not working. We get back Failed to authenticate you for an unknown reason. Please try again later. We can see in the azure logs that the login was successful. We have the same version of Django Microsoft Authentication Backend installed, but for some reason on newly built boxes it is failing but older ones it is succeeding. What could be causing this? What can we check to track down what the issue may be?

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