Steam Link

Steam Link

Help with setup
Hello,
I did the standard setup for steam link on my Apple TV. When I select Start Playing I see the screen with repetitive graphic from a game with the lower portion that reads "Tip You can throw the mouse cursor on or off screen from the controller overlay." The game never shows up, just the same screen, although I do hear some audio in the beginning. When I look at the monitor connected to my computer I can see a logo appearing and being able to choose a game etc, however on the tv connected to my Apple TV It is just the loading screen.

When I try the Start Playing, Steam is running on a Mac mini, connected to my network via ethernet. My Apple TV is also connected to my network via etherenet. The steam link is paired to my computer and remote play is enabled, I have even disabled my mac firewall.

Is there something I have missed setting things up?
Any help will be greatly appreciated, Thanks