Hi @GG
I understand you have already tried the usual reset and reinstall steps. Since the sign-in window closes across multiple Microsoft apps, could you confirm the following?
- Can you sign in normally at account.microsoft.com in a browser?
- Does the same popup close under a newly created local Windows user account?
- Are you using Windows 10 or 11, and what is the OS build under Settings > System > About?
- Does any error briefly appear, or is anything recorded in Event Viewer > Windows Logs > Application at the time it closes?
These results should help determine whether the issue is account-related, limited to your Windows profile, or affecting Windows authentication system-wide.
Thank you for your time