Can't update my phone number

I hope I'm not the only one. I'm trying to get in the pre-sale queue for Wrestlemania 41, but the last time I used Ticketmaster was with my old phone. I've gotten a new one with a different number and they need to send me a verification code, but I can't change it. For whatever reason the box is grayed out and slo can't click on it? Am I doing something wrong or is this a technical issue? Any ideas?

EDIT: Well, I gave up. They won. I just made a new account with my Gmail. This feels like the cable company episode of South Park.