Hello @david_burnside, @Gary_Sabath, and @Jacob_Pennington,
In the Airplay settings on your AppleTV, can you try turning the “Requires Password” option to “On”? You will then have to re-enable the device in Roon in the Settings>Audio screen. Roon should prompt you for the password you have set on the AppleTV. Let me know if this fixes the issue for any of you!
-John