Can't play my digital dl of forza horizon. Disc unreadable error

I bought forza horizon about a year ago. Last summer got rid of my xbox and went on a trip. Got home, bought another 360 and downloaded horizon. It starts, gets to main menu, I pick one player the movie plays and as soon as it’s over, I get error disc unreadable. I looked online and read it might be because xbox doesn’t think this new Xbox is my primary console. I downloaded something else I never downloaded from the store as suggested to indicate this is my new primary console. I deleted my profile and reloaded it, and deleted horizon, cleared memory cache, reloaded horizon, and got the message again. I don’t know what to do, any suggestions would be appreciared. Thank you.

Issue for horizon only, you need to transfer your license from your original xbox to the new one if you wish to play digitally at new xbox but noted it will transfer ALL digital as well.

was this error fixed?

I don’t think so, as not messed up anything, i just use the disc version of horizon if needed for the second 360