You've definitely messed up the install of the freehub somehow, likely a spacer missing, etc. Your freehub is basically bottomed out and won't spin freely.
Not sure how it differs with thru axle, but some of these youtube vids might help show you the different parts:

https://www.youtube.com/watch?v=PJsnIVhICZA

That said, I thought the original kickr wasn't compatible with thru axles...