My Airplay for my TV has been working fine, but today it refuses to work. I tried to go look at the Airplay settings to see if there was anything I could do from there, but I got a "service is unvailable due to network interference" message. I don't know what to do, it was working just fine yesterday.
Ensure that you have your tv and your mirrored device are on the same Wifi. You can also try unplugging your tv for about 1 min and retrying it directly into a wall socket. If you have not already, ensure that you have all of your devices fully up to date.
Always the same solution that provides 0 results. I added a chromecast to mirror my Apple devices. Samsung uses android and could care less about solving iOS related issues.