QR Code Expired - How Do I Activate iPhone 14?

I ordered a 14 from Apple and am already on Xfinity mobile. I can’t activate my cellular because I get a message that the number can’t be transferred. When I try to do it via Xfinity’s QR code here https://www.xfinity.com/mobile/support/article/how-to-activate-phone it says the code is expired. How can I do this without having to go to a store?