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the forza 4 don't work on my account xbox. I tried to reset my Xbox and delete my save and nothing works the game does not work on my user.
On the computer I can play through the user but not on the Xbox. I logged in through another user and it worked.

You've not mentioned what if any, error, you are getting but likely best to contact support in this case;

https://support.forzamotorsport.net