I’m running Zwift on a Macbook Pro with macOS Catalina (10.15.1), connected with a Wahoo Kickr Snap. Unfortunaltely Zwift does find my Kickr Snap and connects, but displays ‘no Signal’, see attachment. However, on my iPhone 11 I am able to pair and receive a signal. So I’m pretty sure this is a Zwift - macOS Catalina data transfer issue. The bluetooth pairing is going ok, but the signal is not send to the Zwift app.
I just upgraded my Mac operating system to Catalina and am having the exact same issue as you mentioned - i.e) can find the KICKR but can’t seem to get a proper signal. KICKR works fine on the Wahoo Utility app so figure it has to be same issue as you. Did you ever find a remedy?
I just bought a new MacBook Pro and it’s working now. However, it still doesn’t work on my old Macbook Pro from mid 2012. Both laptops are running Catalina and I honestly don’t have any idea why my old laptop doesn’t recognize the kickr snap.