Facebook and Airplay

Facebook videos no longer work using Airplay to my Apple TV from my iPhone. Up until a few days ago it worked perfectly. Now I only get the audio with no video. The Airplay settings are still as before, with the Apple TV selected. I haven’t changed anything, it just started doing this, although I do have auto updates enabled on both my iPhone 13 Pro and my Apple TV 4K. Any help or advice would be greatly appreciated!