Hi,
Thanks for posting in Q&A platform.
Before we go further, I would like to confirm the following information with you:
When did the Microsoft sign-in windows will pop up? When using Office 365, OneDrive or some Microsoft website? Could you please help to provide related screenshots for further troubleshooting?
Any and every application the user has an intention of using requires sign-in once again.
May I know whether every application mentioned above is Office application?
Please try to uninstall Office 365 to see if the issue can be resolved.
Meanwhile, the following forum focus on account sign-in issue, I would also suggest you post the issue in the following forum to seek help from dedicate experts:
Best Regards,
Sunny
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