How do Office 365 usernames that contain #EXT# get created?

ronfast used Ask the Experts™
I have a staff person who is collaborating with people who are not on staff. She’s been sharing O365 SharePoint documents and folders successfully for a long time. She successfully shared a particular document with someone but suddenly the person she shared with is getting the following error:
“That didn’t work. We’re sorry, but can’t be found in the directory”

I  would have assumed an account for the external user in the form of: would have been created. but it didn't. I see lots of other user names in that form.
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Most Valuable Expert 2015
Distinguished Expert 2018
Those are created when an invitation is sent and accepted, or when an admin provisions a guest user. Sharing documents doesnt necessarily result in that, depending on the method she used. It's easier to just ask her to re-share the document.
ronfastI.T. Director


Not an ideal solution but it looks like it's the only one.

thank you!!

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial