A good idea would be to delete profile or alternatively to create a new user profile and try to login to O365 account. Completing the above steps resolves a large majority of typical sign-in and activation problems. If the issue persists, Microsoft has created a dedicated tool called Microsoft Support and Recovery Assistant (SaRA) to automate many troubleshooting tasks. If the license is valid and assigned correctly, the next steps involve checking network-related blocks and performing initial device-level troubleshooting. There’s quick repair, which I’ve never had success with and Online Repair, which I’ve always had success with.
Best Practices to Prevent Future Sign-In and Activation Issues
Gone are the days where this is an hours-long process. @scott-sa-spiceworks okay, I "edited" the passwords for Office to my current one in that credential box but Email sync repair for Outlook 365 it did not help. It would be nice to know where that password is being cached, then I might be able to delete it. The following table lists known error codes for the "Sorry, but we're having trouble signing you in" error message.
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Which means that after you’ve enabled MFA, Outlook will start repeatedly prompting for credentials. Many IT people then created an app password for Outlook to use. Modern authentication is safer and won’t go corrupt on you as an app password might. Rich7359 &