I heard that some people were having trouble with playing the Show 21 through XBox Cloud Gaming. I just wanted to post to let people know that it works for me. You do have to load your cloud data every time and it will try to set you up as a new player, but the process to do that is fairly quick. I was able to start a RTTS game and DD game so it seems to be working fine for me. I didn't spend more that 10 minutes trying so maybe a longer session may have issues?
Anyways, some of my friends told me I should let you all know.
Have a wonderful day!