I have just gotten a new update on my samsung tv 2018 version, there is additional menu "Airplay settings", however although its "on", my mac doest detect the airplay display. Both mac and tv are on the same WIFI as I can use chromecast.
I have tried to plug off the tv and turn on again, still the same, I am on update 1251.
TV Model : UA49NU7100
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I'm having similar issues, my 2020 samsung smart tv has refused to screen mirror my 2020 macbook pro for the last 2 months eventhough this feauture used to work prior.
I reset my TV and restarted/setup directly from the SmartThings app on my phone, and it allowed AirPlay to work from both my phone and my Mac. I hope this works for you!
I have struggled to start airplay with my iPhone to Samsung Smart TV QLED Q70T from 1 month and not success as always screen freezes and photo or video stopped screen mirroring.
There after I have found solution by hit and trial that is use 2.4GHz band of your Wifi router for connecting TV as well as iphone or ipad.
Now problem is resolved, Airplay working now flawlessly for complete details please visit by post: