@TeamYouTube is YouTube down again on Xbox one? 2 days in a row I've got an error message saying try again later. I've uninstalled and downloaded again to no avail. Had to go to the dark side and use my @PlayStationUK 

That's odd, could you file a feedback report with these steps: https://goo.gl/6dDQL8 ? We review all the feedback sent to us, but YouTube doesn't necessarily respond to every single one. We use the info to identify and fix issues, as well as track requests and make improvements.