Even though it says “connected,” have you tried clicking on it as though you want to try pairing it? We have a two trainers/one apple tv in the basement, and sometimes when we switch users (one trainer to another), the atv “remembers” the previous pm/cadence/controllable as being “paired” when it isn’t really—just clicking on the pm/cadence/controllable allows the system to refresh and pair for real to the active trainer.
I know it isn’t exactly the same scenario but maybe?