Neo 2T Edge 830 Cycling dynamics option greyed out


I'm running the latest FW on my Edge 830 (5.50) as well as the latest FW on my new Neo 2T (0.34).

The trainer is paired to my 830 as a power meter and as a speed / cadence sensor - Not as an indoor trainer.

When trying to enable Cycling dynamics the unit displays "Loading sensor settings" and after a few seconds it remains greyed out.

See attached for reference

I've tried to completely remove the sensors from my edge unit and also did a few complete power cycles to both the Neo and the Edge but no luck.

I enabled the use Ant+ in the Tacx utility for the trainer as I saw one of the users here recommending that but again, still the same...

Any ideas ?