iPhone Transfer - No Cellular Plan

I upgraded from a 14 to the new 16 Pro Max through TMobile. I received my phone and followed ALL the steps to transfer everything from the old phone to the new one. Once complete, the new phone wouldn't make or receive calls. I looked at the settings, and it wants me to Set Up Cellular. When I click on Set Up Cellular, I have two options: INSTALL a plan or DON'T INSTALL.  when I click on INSTALL, I have two options: transfer from my old phone (which is now already wiped clean) or use a QR code that I don't have and can't find in my TMobile account anywhere.  HELP!!!!!