SharePoint Realm - Should it always be a GUID or can it be any string?
SharePoint Realm is one of those things that is not discussed a lot in the SharePoint world, at least not until you are discussing oAuth and trust. In majority of cases, we are content with the default Realm ID that is set when we install SharePoint. What if some SharePoint administrator thought that it was perhaps cool to change the realm from GUID to any random string? Don't think its possible? Of course it is, just look closely at the Set-SPAuthenticationRealm cmdlet. Set-SPAuthenticationRealm [-AssignmentCollection <SPAssignmentCollection>] [-Confirm] [-Realm <String>] [-ServiceContext <SPServiceContextPipeBind>] [-WhatIf] [<CommonParameters>] Attribute Realm is a string and it allows an administrator to choose any string of his liking to be the new Realm ID. I just finished troubleshooting for a customer where the customer was unable to run any of the full-trust add-ins that they had on a new farm they had setup. The add-in