We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
If it simply says 'disc is dirty' or 'do you own this?' and you need to reinsert it AND you're in the Update Preview, the issue is with the latest update and is being patched, and a complete power cycle is a temporary workaround.
Even if you're not in the Update Preview, try a power cycle and see if it resolves your issue: