Forum Discussion
Word for Mac Office Add-ins authentication fails, but works in Word Online
- Sep 23, 2026
I have received advice from the Word Product Team at Microsoft that the issue has now been resolved with a change on the service side.
A small number of users may still see the issue if their device is using cached credentials. They can work-around the issue by signing-out and back in or waiting for the token to expire.
This is a known issue with Office Web Add-ins authentication on Word for Mac: the desktop client sometimes fails to pass authentication tokens correctly, even when Word Online works.
May try on below:
- Clear the add-in cache folder and reinstall Word.
Thank you for the suggestion. I did clear the Office/Word add-in cache as part of the troubleshooting, although I did not reinstall Word. Unfortunately, clearing the cache did not resolve the issue at the time.
The issue has since resolved without any further changes on my end. As another MVP confirmed with the Word Product Team, Microsoft implemented a service-side fix (which appears to have resolved it for me as well).
Thank you again for taking the time to help!