I just purchased an Apple Watch, Series 6. I also have an iPhone 10S. Youtube on the iPhone worked perfectly in the morning on my iPhone, but once i got my Apple Watch and synced it to the iPhone, VoiceOver no longer interacts with Youtube.
Youtube can still be navigated with VoiceOver turned off. I have tried uninstalling and reinstalling Youtube, I have turned off and back on the iPhone, turned off and back on the Apple Watch, and turning off Bluetooth on the iPhone. The problem initially happened when I noticed an option on my watch to play/play what was on my iPhone, which happened to be a Youtube video. Best I recall, and this was just yesterday, is I paused the content on my iPhone, then went to hit "Play" on my apple Watch some time later. The video started playing from my iPhone after I pressed play from the Apple Watch, but from that point forward when opening Youtube on my iPhone I am unable to interact with the application at all. VoiceOver is completely silent when swiping left or right. All it will read is the status bar as the top with the time, WIFI indicator, etc. Visually there is nothing wrong with the application. The only thing I have not tried at this point is unsparing the watch from my phone.
I would appreciate any thoughts or suggestions. I am of course running the most current version of the Youtube app as updated on the App Store, the most current version of IOS for iPhone, and the most current version of Watch OS.
Thanks for any help,