Fitness+ workout have black screen, no video

Since upgrading my iPhone, watch and Apple TV to the new releases I’m having problems.

I can start a workout using the Fitness+ app on the Apple TV. It launches and I can hear the audio and see the rings, music info, burn bar etc but the video isn’t working so other than the data that is overlaid - the screen is black.

I did a whole workout listening to the audio. Not ideal.

Anyone else or just me?