My wife’s statement closed Sunday and by noon Monday the companion pass showed up in her Southwest account with a link to add a companion. DO NOT USE THAT LINK TO ADD THE COMPANION. If you use the link like I did it will take your name, birthdate and address but does not have a place for your rapid rewards number. It then automatically generates a new RR number. I called SW and the lady was able to add my correct RR number but she was very clear that it counted as one of her 3 changes. A second lady I spoke with says they alway recommend calling and having them add the companion.
I had the same problem. Using the link created a new RR account for my kid. Which I had just created one to get a RR number for him. Lucky it was both brand new. So the agent basically just tossed the account I created and now we’re using the system generated account.