I cannot play Youtube videos on my Lumia 950, my Windows 10 laptop, or my Roku 2. When I use Metrotube, it spits an error. I have not heard anything about a widespread outage. This has been going on for several days.
Metrotube is working fine today on my 920 with Windows 10, but not my W10 pc or SP2 with 8.1. In recent weeks I've been unable to play videos with a duration longer than about 10min. Weird.