I have just received a replacement cable from local Garmin Support in Spain.
They worked as expected: no questions and fast delivery of a brand new cable.
A+ for Garmin Support.

After three GPS cables installed on my bike (one TomTom Rider 550 shit, unable to connect with iPhone bluetooth... and ...

You're not alone.
Defect on arrival, one week ago, and still waiting for a solution from reseller or Garmin Support...

Find here an image of my stuck "PONGO pin" and damaged rubber seal: https://www.bmwmotos.com/foro/attachments/img_4134-jpg.201521/

It has zero minutes use... defective on arrival.