SharePoint online document- permissions error when using @mention

Question

I have a user who has contribute permissions on a PowerPoint document stored in SharePoint online. When he tries to create a comment in the document and tag a user using the @Tablet of another internal user who also has contribute rights to the document, he gets the error 'You don't have permissions to grant access to this item'.

Using the SharePoint 'check permissions' verifies that both users have 'contribute' permissions applied.

Any ideas on how to fix this?

Answer 1

Hi @Axyrium
Unfortunately, I still cannot reproduce this problem and have not found any official articles to explain it, I would suggest you open a service request in Microsoft 365 admin center for better help.

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Answer 2

Hi @Axyrium
Commonly, if the two accounts both have contribute permission, you will not receive this error.

You could check whether this document has unique permission: Manage access > Advanced, and use check permission function to check whether these two accounts both have contribute permission:

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Answer 3

1.change a document library or site to see whether this issue persist
Same on another document library.

2.change a browse or clear browse cache
No change- tried 3 browsers, and using incognito/private no change.

3.try to use another account to check it
Happens with a test account as well. Test user has contribute access and can edit the dock. but another user can't use the @GN without getting the same error message stating that the test user doesn't have access.

4.Is there anyone else meeting this issue?
See #3

Starting to think it has something to do with using the 'everyone except external users' group which I'm using to provide view only access for everyone in the company. Users that can't be mentioned have contribute access by way of a security group I created, but also have 'view' permissions via the 'everyone except external users' built-in SharePoint group. When I use SharePoint to check user permissions of people in the security group granting contribute access, some of the users only show as having only view permissions while others show contribute.

I though I read somewhere where there is a hierarchy of how permissions are applied regardless of permissions level. Will explore this next.