Elite Turbo Muin 2 pairing inconsistently

Hi, I’ve just started using Zwift and have an Elite Turbo Muin 2 (which is a smart trainer, unlike the previous model) with a Misuro B+ linked via an ANT+ dongle to a laptop running Windows 8. When pairing, Zwift always finds a Cadence sensor and a Power Source but rarely finds the Controllable device. I have no other devices paired although I did unsuccessfully attempt to pair the unit with a bluetooth dongle but gave up as it paired nothing. When loading Zwift, before pairing, I get a Run Time error - Z1 Is this error connected with the pairing issue.
Thanks