@TeamYouTube Hello youtube team! “JOIN” button is not showing up on mobile device, it’s only showing up on PC. 90% of my videos viewed on mobile device. Can this be fixed ASAP? I’m losing a lot of members. Thanks 
The feature is currently unavailable for iOS devices. Could you file a feedback report with these steps: https://goo.gl/1ckkO5 ? While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues. Thanks.