Halo Wars BC not working?

Yes, I am in the Preview Program. I don’t have the option to install it and when I put the disc in it says it’s not on the list of backwards compatible games.

A bunch of my friends have been playing it every day and I can’t join them which is frustrating to say the least, considering that I’ve been in the program longer than any of them.

Anyone else have this problem or a solution?

I would reach out to Xbox Live support on this one OP, maybe make a post over on the preview program forums on xbox.com? They will like have some solutions there or will be tracking issues with BC titles