Update: Just concluded a chat with Xfinity. TL;DR: activation is still in progress and I need to keep waiting. There was "an error with the esim card".We upgraded two phones with existing Xfinity Mobile cell service. One activated withing 10-15 minutes. My phone started the activation on 10/19 around 12 noon. New iPhone 14 Pro still not activated. My old phone's cell service is still active. Chat on 10/19 told me to wait and it will be activated in 2 hours. Didn't. Called this morning (10/20) around 6:30 AM and they said keep the new phone off and the old phone on. When the cell service disappears off the old phone, turn on the new phone and it will activate. Called back at noon. Same answer. So, in a holding pattern.
I'm not sure what the following means but it sounds like they are offering to add a new line to my service so that the new phone would have two lines (my existing number and a new number)???
"I would like to share that As we are working on the concern of activation, Meanwhile I would strongly suggest you to please activate the device with the number with eSIM.
I would like to inform you that Xfinity has recently launched the e-SIM, and if you want, you can get the e-SIM for your current device and you will be able to use both the lines on the same device, Also, I can check that you have (an unlimited data plan, after adding the new line, after adding the e-SIM with the new phone number or the current phone number and get the new phone number with physical SIM card with additional cost of $0.00 on your monthly bill). This will just help your device to activate on the IMEI 2 and it will cost you $0.00 only. And there is teh best quality of eSIM that you can delete it if is not in use. The eSIM will get activated right away."