Issue with Apple TV V5 4k along with Kickr V5 where the kickr climb had stopped responding during gradient changes.
I tested it against a map loaded from eliment bolt and this showed that it was not a hardware or communication error between wahoo products.
With the advice from @Shane_Miller_GPLama the latest version app was removed from the apple tv and then reinstall. This resolved the Kickr Climb issue where now the climb is responding.
Now to test that pesty failure whilst calibration spindown is being performed.