Airplay has no sound.

I just bought a brand new 4k Apple TV... I also have a brand new Apple Mac Pro, iPhone X and iPad Pro.... Whilst I can mirror the visual to my Samsung SMART TV... I can hear no sound. Meanwhile my Apple TV keeps giving me the searching for Apple TV.

Whats even weirder... is that I am now currently mirroring to my TV screen however the Airplay icon has complete disappeared. I love my iPhone, iPad, iMac but absolutely hate this piece of rubbish Apple TV... its the only Apple product that I hate due to the constant problems I've experienced. I can't even access my iTunes music library which is one of the main features of this ultimate crap product. Steve Jobs must be turning in his grave. So disappointed in you Apple and no where online can I find a solution to my problem.