Dear Community,
I’m totally new to this forum and new to xbox
Just bought one to play Forza and totally love it. But when it cames to local multiplayer I’m disappointed. Just tested playing with my best friend while having a great evening with the Forza carrer but we also liked to play against each other. The disappointing point is that we could only play against ourselves without other drivers (drivatars), is there really no possibility to get this working? This would be the best thing in the World. 
Best Regards!
Unfortunately there is no way to make it work on one console. If possible, have your friend on another Xbox One and create a private multiplayer lobby where you can invite your friend and add Drivatars to the grid.