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.

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.

Additional resources

Then try to activate the installed Office 365 suite again on your computer. You may need to remove old Microsoft Office licenses from your computer and install a new one. So figuring that was the same issue here, I did the same thing.

Difficulty in updating a SharePoint file with another user

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.Check the version of Microsoft Office installed on your computer and your subscription name and expiry date.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.You can set access permissions for the entire organization or invite only the users you specify.

Microsoft Office 365 Activation Issues

This tool should be installed on a computer as a standalone application. After installing and running the application and entering the Office 365 account credentials, run tests to identify the problem and find the needed solution. Follow the instructions provided by the assistant to find and resolve Microsoft Office 365 problems.

How do I fix Outlook login problems?
11 tips to Fix Outlook Login ErrorTip 1 Delete email account or your Outlook profile.Tip 2 Delete the files from your Outlook directory.Tip 3Modify your registry.Tip 4Delete Outlook key from registry.Tip 5Enable the option Outlook Anywhere / Exchange Proxy Settings.Tip 6Allow Exchange to configure your account.More items...

Repair an Office application

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.

Just today he IM’d me and said "oh yeah, this other issue we have been trying to fix for weeks on end… it was ALSO just resolved because we fixed this". My main concern is that these dialog boxes may return, prompting further user frustration and possibly generating tickets. Speaking of research, I haven’t found much info newer than December 2018. I haven’t opened a ticket with MS Step-by-step guide for Outlook stuck on profile yet but I may if my search does not prove fruitful. Once the key is added, and the user restarts Outlook, they receive a legacy authentication dialog box, enter their domain password, and connect to their mailbox without issue. This seems to be our most effective fix, and it’s the one we arrived at after hours of forum digging and web searches.

Domain Verification Issues

For all of my Office 365 clients, including my own setup from the Action Pack, Modern Authentication is enabled. I have run into multiple Outlook 2016 installations where the only way to get connected to Outlook is to add EnableADAL and set it to 1. These have been fresh Office 365 Business Premium installations, existing Office 2016 OEM installations, and on my Action Pack installation of Office 2016. We haven’t seen this issue arise when a user is on a machine that was originally imaged with Office 365.