A Microsoft file hosting and synchronization service.
Hello
Was this user just created today?
When you said it didn't send, can you describe the behavior, for example, any error message, any bounce back email, etc?
Also, how exactly did the user share, right click on the file in OneDrive app, or via www.onedrive.com, then use share, and put in email address??
Does it matter what email address this user put in? Please provide as much info as you can to help narrow down the issue. Thanks!