Thanks for the advice. Missing the spacers and the adapters for 142 DS and NDS. I originally set it up for 135 QR and lost the other bits - probably in a lockdown induced feverdream
I got mine off here and noticed the brake caliper rubbing on the body. Known issue that Garmin sort with free spacer kit. Maybe mention caliper rubbing and see if they send it out to you.
I contacted Garmin and they sent me the TA kit for free. I'm assuming you're missing a spacer in the setup somewhere.