I'm the IT guy at an elementary school. I gave an M1 Macbook Air to one of my tech-friendliest teachers to be my guinea pig. She reported that she couldn't airplay to her 6 month old Roku Smart TV (TCL brand) with the M1 Air, but she was able to airplay with it through her Apple TV. I was just about to get rid of all of the Apple TVs in the building since Roku is now Airplay friendly, but I'll have to wait until this bug gets figured out.