Game wont load / startup.

Recently i re downloaded Black ops 4. My brother originally bought on his xbox and we both played it via gamesharing.

Without thinking i set my home xbox onto my xbox a while ago meaning the game sharing stopped so i couldn't play the games he had, that being black ops 4. Since his xbox is damaged and had a hard drive failure it cannot be fixed therefore i cannot go onto
it again and set the home xbox. He has since got a new xbox and his account is logged in and plays it as he usually would. I have tried setting my home xbox onto that xbox to see if it would revive anything but im still unable to play Black ops 4 on my xbox.

Im not sure if this is even a game sharing issue but it seems to be. Once i load up black ops 4 it loads onto a black screen once i click and around 10 seconds later it quits and goes to the home screen. I see no way of fixing this and have searched up every
possible solution like removing accounts, etc.

I can see that the game was clearly bought on his account as i looked through the order history just to be sure.

If anyone knows a solution to this please post it, im beyond clueless at this point.

Thanks.

:)