Can't sign in to Microsoft 365 desktop applications
https://learn.microsoft.com/en-us/microsoft-365/troubleshoot/authentication/cannot-sign-in-microsoft-365-desktop-apps
On a device that has security software installed, you might experience any of the following issue…•The sign-in prompts are intermittent. •The sign-in window shows a blank authentication screen.•The sign-in window is stuck on authentication.
On a device that has security software installed, you might experience any of the following issue…•The sign-in prompts are intermittent.
•The sign-in window shows a blank authentication screen.•The sign-in window is stuck on authentication.
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