One of the negatives I guess of buying a bike, unseen, from an exclusively on-line vendor.

Here's a screen-grab of the relevant page I found in Shimano's manual for the Rear Derailleur: Shimano CUES RD-U6020 (10 Speed) on my Diverge -


I'll relocate that cable into the groove, see what happens....

When I received my Tarmac (same vendor) near the end of the 2024 biking season I wondered why I was having some 'issues' over the FDR performing as I'd expected. Taking things further (as is my preference, and as I'd not dealt with a 'local' dealer) I came to learn that its little 'support screw' (virtually hidden in the DR mech) needed to be tightened against the backer plate bonded to the CF seat tube, otherwise the DR would twist slightly under cable tension. Don't recall if that came via a tip here on the BF forum (I'd just recently joined) or my searching through Shimano's maintenance files on line. Tightening that little screw fixed things virtually instantly.