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?