Power Meter/ Kickr Snap resistance issue

Hi there - I have been using Garmin Vector pedals for years as my power meter, and always connect to them when using Zwift, however my pedals are no longer working, so I have been connecting to power via the Kickr Snap - the resistance is so high I can’t even pedal! I am exhausted just getting through the warm up! I have tried calibrating the kickr, but it doesn’t seem to make any difference and just end up super frustrated and call it quits. Any ideas on how to fix this?
Thanks!