A solution for this for me since my previous service cut off and I couldn't call in was to go into my cellular settings, turn off my old carrier service and activate my ESIM. As soon as I turned it on (it was off by default after getting notification...
Thanks for posting and sharing the update.Same happened here, tried to pay and go to next page to start to port my phone number over and charged my credit card twice. Hopefully it'll get working again tonight or have to try tomorrow morning.