I’ve been using Apple TV for a couple of months, and only recently had an issue.
When pairing via Apple TV (Kickr18 as power source, controllable & cadence, Tickr for HRM) my Kickr Climb works as it should.
When using the Companion App, either on my iPhone or iPad (Favero Asioma pedals as my power source & cadence, Kickr18 as controllable, Tickr as my HRM), the Climb doesn’t respond to gradient changes. If in the middle of the ride I switch to pairing via Apple TV instead of the companion app, the Climb begins working. A few times I’ve done a U-turn, ridden for a minute or so, then another U-turn (while paired with the app), and the climb starts going up & down, like it’s catching up on all of the gradient changes that it missed. After a minute or two, it works fine.
Throughout, the Climb is paired with the Kickr.
This has only been recent, I wonder if it’s related to the game update, or app update (not sure when that was).