I bought Halo Reach but it says it was and add on and won’t let me play it and I already...

It's an add on for The Master Chief Collection. You would need that game in order to play it.

thanks for replying when the Xbox was bought, it was bought with gta on it already so when I set it up, all i had to do was download the game and I didn’t need the disc. I have been playing on gta5 since December with no worries and now it won’t let me
play.

I have made sure that the console is set to it’s home console and it still won’t work. What do you mean when you say that the license was taken away?

I have followed those instructions and it still won’t let me access the campaign it just says that I haven’t bought it but I’m playing on the disc version so I have?

It won’t let me play the open beta and I bought the expensive one

I just finished downloading cod mw3 and now it won’t let me play anything it keeps saying need to purchase modern warfare 3 but I already have?!?!