A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Thanks for your confirmation, @Angharad Davies.
To move forward, can you provide some additional information:
- May I ask when checking the site’s full user list and remove the old entry manually by accessing this link:
https://<site>/_layouts/15/people.aspx?MembershipGroupId=0, can you find the external user's entry? - Does this issue occur when sharing from all sites, or only from a specific site?
- Could you try removing the user from the Entra ID Center and then adding them back one more time to see if the issue persists?
- Does the issue only occur with a specific email address, or does it affect other external addresses as well? Also, what type of accounts are involved (personal, work, or school)?
I recommend referring to the following instructions to fully remove the external user entry before adding them back again: Remove users from SharePoint - SharePoint in Microsoft 365 | Microsoft Learn
Looking forward to your response so we can get this sorted out for you together.