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A user in SharePoint subsite has FULL CONTROL of access but cannot access permissions list.
A user in a SharePoint Subsite has Full Control of access but when she tried to access the permissions of the subsite, an error shows that "Sorry, you don't have access" Please help. The user...
I had this happen the other day. Link to the solution below. Hope it helps. The issue happens when you delete the Owners group after site creation, then set another group as owner or don't have an Owner group.
https://support.microsoft.com/en-us/help/2911390/access-denied-to-access-requests-list-or-request-approval-failed-when