On SharePoint team site, one of site owners cannot access Site Permissions page.
When he tries to open that page he gets message bellow
Weird thing is, when he sends request to access that page and I get mail, I give him permissions (tried contribute, Full permissions) he again gets same message, Let us know..
Worth mentioning is that he can give permissions by opening item's Open menu and then putting names of users with whom he wants to share SP location.
I went to logs and saw the only error/warning I got was
Non-OAuth request. IsAuthenticated=True, UserIdentityName=0#.w|domain\username, ClaimsCount=37