This issue being related to the AAD broker plugin is literally NOWHERE else on the internet. You can disable Add-Ins on launch by pressing CTRL and hitting the Microsoft Office app shortcut. In this case, consider using safe mode, which is useful for Office 365 troubleshooting.

Tools That Can Help

I do NOT have this issue with the other laptop, an iPad, a MacBook Pro and tablet. But as soon as i log out and log back in, the plugin desactivates itself and the authentication bug comes back. Get a free trial to explore all the solution’s data protection capabilities. Domain verification issues can also prevent the normal use of the Microsoft Office 365 suite. Organizations value the capabilities that the Microsoft 365 suite provides for shared access and simultaneous file editing for team members.

Accidental deletion of important files

To diagnose and automatically fix several common Microsoft 365 sign-in issues, run the Microsoft 365 Sign-in troubleshooter. The authentication issue occurs because of missing package information about either the Active Directory Authentication Library (ADAL) or Live ID. This issue occurs only on computers that are running Windows 10, version 1703 or later, and Microsoft 365 version 1807 or later. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I figured it was a bad credential, and everyone mentioning ADAL pointed me to the right one.

How to fix Office 365 issues related to synchronization

If multiple versions of Microsoft Office are installed, Office 365 activation issues may occur. Uninstall old versions of Microsoft Office from your computer and try to activate Microsoft Office 365 again. This works for a week and then the issue raises it’s head again.

You can try to repair Office by using the appropriate built-in tool.If your account is locked but you have not defined your recovery email address, try to fill out the Microsoft account recovery form.Some of them allow users to get updates before the main release while others provide updates at a later time.Installing Office 365 updates can fail for different reasons, and some of them are listed below.I don’t know if this is a permanent fix, but it got me back online.The good news is that the majority of problems can easily be solved on the client’s side.File and storage issues with Microsoft Office 365 are more serious than other issues.

Email and Synchronization Issues

These add-ins can cause issues such as app crashes or significant performance degradation. Office 365 syncing problems are common for Office Mobile, but sometimes similar issues may occur for Office 365 desktop applications like OneDrive and Outlook. After looking deeper into my problem with my RDS servers, the only solution I found is to run the script of @spiceuser-lijul into a GPO at each user logon.

How do I reset my Office login?
Reset a forgotten Microsoft account passwordSelect "Forgot password?" If the "Enter password" window is still open select Forgotten your password? ...Verify your identity. ...Get a verification code. ...Enter code and reset password.

Additional resources

Many issues that you may face day-to-day can be fixed on the client side. If you encounter an issue in Office 365 that can only be fixed by the vendor, Microsoft usually releases an update to resolve any known issues as soon as possible. This is now the 2nd machine that presents the same issue. I have a valid MS 365 subscription that includes 5 device licenses. I checked my MS account info page, subscription is fine.

I highly recommend NOT just disabling modern authentication Tech fixes at FixTechGuide using that registry entry because you will have all manner of headache with other Office365 applications. Some of them allow users to get updates before the main release while others provide updates at a later time. The update channel used by Office 365 depends on your Office 365 subscription plan and on configuration. If after running the Remote Connectivity Analyzer Office 365 issues are not fixed, try using Microsoft Support and Recovery Assistant.

As soon as he figured it out he handed the full fix to MS support with all instructions as shown above. So hopefully the official MS support answer and documentation will change. It’s nuts to me that MS has had this issue for YEARS and has just been duck taping it and moving on. Disabling ADAL can "fix" the issue with outlook but in our experience it still left TONS of other stuff broken.