Watch website vod/YouTube Chromecast bug

I wasn't sure if this should go here or in the esports board, since it's a website bug and not a game bug ... Hope this is the right place.

I've been trying to watch games for my watch and earn missions (which are currently kind of broken, but you know that) and have had issues with using my phone to cast vods to the Chromecast. Casting anything, vod or livestream, from the computer works, and casting livestreams works on the phone as well. Watching anything directly on the phone also works - just not casting it to my TV/Chromecast. I can also cast directly from the YouTube app on the phone, or from embedded YouTube videos on other websites - just not from your website. I tested this with several videos and two different phones (both Android), so I don't think it's an isolated issue. I'm sure you're busy fixing the mission reward issue, but please look into this when you have time.