Noise on lower cogs with new Kickr and new Bike

Noise on the lowest two cogs. I just got my Wahoo Kickr Smart Trainer. I’ve set it up with a 2021 Giant Contend AR 1. I’ve noticed that when the chain is on the lowest two cogs I hear this rattling sound. My bike is 700x32c, 11 Spd rear cassette (so I’m using the supplied one), 142mm Thru axel. When I move the gears to the middle cogs it’s really smooth. Any suggestions?

link to


Solved. Combination of tuning the indexing in the rear derailleur and avoiding cross chaining with the small ring. That’s it!!