Forza Horizon 3 Game disappeared after a second account was created

I have the following problem, I created a second account for Forza Horizon 3 for my friend after I loaded the game and synchronized the scores from my main account were no longer loaded or I had to start a new game. I already talked to the support for Xbox Live and I was recommended to reset the Xbox but only a few vehicles from the Forzathon were loaded again but the credits and vehicles and the level is still not there.
I hope I can help with the problem