issues with SharePoint sharing

Jeffrey Tucker 341 Reputation points
2021-03-10T18:42:21.723+00:00

Our corporate IT manages our O365 so I do not have a way to make changes. Our UPN for login to O365 is employeeID@domainname.com. When someone shares something with one of our users via email address, the user in our tenant goes to login to the SharePoint resource and is presented with the message "You're trying to accept your invitation with employeeID@domainname.com because that is what we use to login. Entering the email address presents the message "the username may be incorrect...." Do we have to provide users with employeeID@domainname.com instead of email address. Mail to employeeID@domainname.com works.

SharePoint
SharePoint
A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
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  1. Elsie Lu_MSFT 9,756 Reputation points
    2021-03-11T06:12:57.47+00:00

    Hi @Jeffrey Tucker ,

    SharePoint Online is not a public site, so usually you must log in with a Microsoft account.
    However if you just share some resources on the site such as files, using external sharing is a good choice.

    References:
    External sharing overview
    How to share files and folders externally in SharePoint

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