Originally Posted by Gtstcactus

I’ve had decent success getting airlines (including TAP) to change my FF# to my chosen program (Air NZ Airpoints) FF# by sending a private message on Twitter / X.

From *A I have had Aegean, TAP, and Swiss do it for me recently…

In each case I had ended up with the wrong program FF# being associated with a booking when loading flights into one of the airlines apps that wasn’t my home / preferred airline and it was changed without my requesting it.