Foza Horizon 1 Game data not transfering!

I understand that this is the wrong game but I had no ither way of getting this point across. I have recently installed Forza Horizon for the Xbox One after it became backwards compatible but without knowing all of my game save has not been transfered over which has really put me in a bad mood about the games and I would like something done sooner rather than later. I have totalled up over a weeks worth of gameplay and I have had every car in the game and it has put me off playing now until this is fixed and if anyone else has the same problem then you will know what I’m talking about. Fix it A.S.A.P please.

Try this

http://forums.forza.net/turn10_postst68952_My-Save-on-Forza-Horizon-is-no-longer-existing-from-previous-use-on-Xbox-360.aspx