I did the same, deleted and re-installed my game entirely and did not work. How you do the cloud gaming is as follows; 1) download and connect the xbox app on a computer, 2) click cloud gaming on the xbox app, 3) choose your game. At this point its pretty self explanatory and through the cloud on PC while logged into your xbox account, you will be able to see those friend requests and join them and play. But the moment you switch back to your xbox, it doesn't register the friend requests you just accepted.
Also downside to the cloud on PC, unless your laptop is really good, you are going to have extreme latency issues while playing on your PC through the Xbox App on computer