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There could be several reasons for the Firebase user object being null when using Microsoft authentication, including:

1. User cancellation - If the user cancels the authentication process before it's completed, Firebase will not create a user object.

2. Authorization failure - If the user does not grant proper authorization, Firebase will not create a user object.

3. User account deletion - If the user's Microsoft account has been deleted, Firebase will not be able to authenticate and create a user object.

4. Configuration issues - If there are configuration issues with the Firebase project or the Microsoft authentication settings, Firebase may not be able to create a user object.

5. Network errors - If there are network errors during the authentication process, Firebase may not be able to create a user object.

It's important to properly handle these scenarios and provide appropriate feedback to the user.