Roon and Apple TV4/AirPlay 2 — Comnpatible or NOT?

Are you running Roon build 363?

I have it working on my Apple TV 4K, tvOS 12.1.1.

On the Apple TV in Settings > AirPlay I have Allow Access set to Same Network and Require Password = Off.

In Roon, when you enable Apple TV, it will give you a 4 digit code on your tv screen, enter the code and press Return. That should enable it.

Cheers, Greg