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User Cannot Access One Specific Site and I Can't Figure Out Why
User can access other sites, but this one particular site, which many other users can access, they cannot. I've tried: Granting direct access (typical access is via Members group). Granting direc...
Try this, it helped me in the past, you can find it in the Admin Center - Support - help & Support
AndresGorzelany Thank you! That was it. It detected a "https://learn.microsoft.com/en-us/sharepoint/troubleshoot/sharing-and-permissions/fix-site-user-id-mismatch" for the user on that site, then I allowed it to remove that ID completely. Once it was finished, I added the user back to the Members group and they were able to access the site. Thanks again!
Glad to hear, yes, usually mismatched ID occur when reactivating old user objects. Very glad to hear it has fixed it for you