I had this exact issue on another machine, that after 2.5 hours on the phone with MS support (via Zoom), the solution was to uninstall MS Office 365 and reinstall it. Spent weeks with MS support and he got rather irritated when they told him to disable ADAL. He then started digging into Windows and how modern auth works and came across the above fix.

Office 365 won't log in without EnableADAL = 0

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.

Repair an Office application

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.

Common Problems with Office 365 OneDrive

The operating system on which your Office 365 applications are installed does not support the updated version of Microsoft Office 365. Windows 7 and Windows 8 do not support the latest Office 365 versions, and only Windows 10 supports these (Windows Server operating systems are not covered here). Always define a recovery email address when configuring your Office 365 account.

So figuring that was the same issue here, I did the same thing.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.It’s nuts to me that MS has had this issue for YEARS and has just been duck taping it and moving on.I'm also getting Error 29, which the MS support rep couldn't explain to me.After installing and running the application and entering the Office 365 account credentials, run tests to identify the problem and find the needed solution.Uninstall old versions of Microsoft Office from your computer and try to activate Microsoft Office 365 again.

Email and Synchronization Issues

I don’t know if this is a permanent fix, but it got me back online. If i run and install the AAD Plugin as shown, it’s fixing the issue. Hours of tears and nerve-wrecking frustration and you fixed it all with that blessed Powershell command.

How to fix Office 365 login issue?
Step-by-Step Troubleshooting for Microsoft Office 365 Login IssuesCheck if the caps lock is on.Make sure you are using the correct account (work, school, or personal).Double-check the username and password before entering.Ensure there is no extra space before or after your username and password.

Microsoft 365 Issues with the Safari Browser

Check POP3 and SMTP settings for connecting to Microsoft mail servers (addresses of servers, ports, encryption, authentication). If you use Microsoft Office 365 Outlook as a standalone email client, and you cannot send and receive email messages, check the Outlook connection settings. Make sure that network access to the Microsoft servers is not blocked. Check the firewall on your computer, the router, and DNS configuration.

Try testing the configuration of your Office 365 email system and fix the problems that are preventing users from using the email services. Microsoft Support and Recovery Assistant can help you resolve problems with Microsoft Office, Office 365, and Outlook. Open the required file, hit Share and then check the list of users that you can give the rights to edit a file. You can set access permissions for the entire organization or invite only the users you specify. This error appears when you attempt to upload or save a Microsoft 365 item. It indicates that you have reached the storage limit specified by Office 365 login issues your subscription plan.

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.