Stream doesn't work in iOS Mobile App (both current and vnext beta)

This is something we've been working on and continue to work on.

This has been a really hard problem to solve due to a bunch of technical challenges. 

For the Android SharePoint Mobile app we were finally able to make it work where if you use the Stream webpart on a page and then load that SP page in the SP Android mobile app it now automatically logs in and you can play the video. The final changes to make it work on SP Android app are slated for one of the next updates to the app in the coming month or so. 

However, the same set of solutions we found for Android don't work for iOS. There isn't a way for iOS apps to allow cross domain cookies to be set from iFrames inside a webview. We are still trying to find creative solutions, work arounds, ideas, but so far everything we've tried hasn't worked. We may need to go back to a more extreme re-architecture to make it work.