Me and a friend are trying to game share, but when me and him tried to set our xbox as our home xbox with each other's accounts, it gives an error saying something along the lines the settings weren't saved before change. We don't know what's wrong.
If you have set multiple home xbox's for said account, you only are allowed to use this option three times in a calendar year... so I would try again on January 1st or contact Microsoft directly and they may be able to issue another one.