I bought the 2020 Samsung Q60T 43" TV about a month back and was excited that it had Apple AirPlay, got the TV all setup and everything was fine. Well I updated my TV, and my iPhone 11 Pro Max recently and decided to do some Screen Mirroring to my TV only to find it's no longer showing up in my list of devices. I've checked to see if there are any updates to fix this and I cannot find anything on it. It's gotten a bit frustrating and I am wondering if anyone has any advice or if they're in a similar situation.
Try walking through the troubleshooting here from Apple: https://support.apple.com/en-us/HT204291
Does a step from there help? If not, check out the Samsung article on using Airplay 2 with your TV: https://www.samsung.com/us/support/answer/ANS00082643/
I hope the above helps. If you find a step that works from the articles, can you reply here to let us know and choose this comment as a solution?