This is a quirk between Microsoft 365 and macOS. When you see the banner across the top of the application window, click on the button on the far right side that says "Use Another Account." Enter your ...

Microsoft is showing banner advertisements in the PDF viewer in the Microsoft 365 (Office) mobile app. The ads have only been reported on Android devices, but they are even appearing for some ...

Settings app has a built-in feature that can detect when your Microsoft 365 has expired and show a notification directly.

As an immediate measure, Microsoft recommends affected users click the “Reactivate” button in the warning banner.