Reach is installed on xbox one, but won't open

So my brother just installed Reach on his Xbox, but for some reason, even though it says it’s installed it says he needs to install it. The game itself even says it’s installed yet for some stupid reason, it refuses to let us play the campaign or multiplayer. We have already tried reinstalling everything 4 times. Xbox won’t help. Anybody have any suggestions? I don’t expect much but this is just bizarre.

I am having the same issue

Also having this problem. I was excited to play but it just keeps saying missing content and then says it’s downloaded on the next screen

I get the “missing content” on my 360. That one is only referring to reach themed xbox avatar stuff.

For the xb1 even after its download you still have to go to the microsoft store and pay for it to unlock some modes.