We understand players have had trouble accessing Minecraft Preview on Xbox today. This will be resolved by an update in a few hours.

Can you please explain what issue you're facing that we can help out with? If you provide any screenshots, make sure to block out any personal account info in order to keep your details safe and secure! ^FF

Usually when this happens it means you're logged in with the wrong account. Please try logging in with any other accounts you used for the migration; including the email that was previously on your Mojang account, and emails with non-Microsoft domains (Gmail, Yahoo, etc.) ^NS