I have one of new Samsung Frame TVs with airplay 2 support (model QN50LS03TAFXAZ).
When I mirror my iOS device to the TV, things kinda work (video streams, but audio drops every 5 seconds for a second). However, when I go to share/airplay (little screen icon with arrow in it when you’re watching a full-screen video on the iOS device) a video to the TV, I get a spinning grey wheel/fan on the TV, while the iOS device indicates it’s streaming to the TV. No audio, or video on the TV, just the spinning.
The iOS device I’m using, and the TV are running the latest updates/software.