What could be the reason for my Microsoft Teams personalized application remaining in the login popup window?

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There could be several reasons why a Microsoft Teams personalized application remains in the login popup window. Some possible reasons include:

1. Technical issues: There could be technical glitches such as network connectivity issues or system errors preventing the application from loading correctly.

2. Incorrect authentication details: If there is an issue with your authentication details such as an incorrect username or password, the application might not load correctly.

3. Permission issues: The Microsoft Teams administrator might have restricted access to the application, preventing you from using it.

4. Compatibility issues: The application might not be compatible with your current version of Microsoft Teams.

To determine the cause of the issue, it is recommended to contact the Microsoft Teams support team for further assistance.