For me, it was this: metadata.supportsContinuationOnTV = true The doc says the default value of supportsContinuationOnTV is true, but that (and it) is false.

I am experiencing the same behavior, using the sample app (made a tvOS target). I can shareplay from tvOS to an existing FaceTime session, but not the other way around. The option appears in the control center on tvOS, but selecting it results int he Unsupported Activity message. Has anyone figured out what can cause this (the previous comment notwithstanding)?