Pairing with kickr?

Hi all

Has anyone been able to pair the Vivoactive4 with a kickr18?

We can pair the watch  fine with the cadence sensor of the kickr and also the  phone, headphones etc but the kickr is not being detected. Any advice would be appreciated. both are updated to the latest firmware etc.

Works fine with forerunner 935 but not with this it seems.

cheers