Can’t set up Cellular on Apple Watch

I got my watch yesterday. Everything worked fine until I got to “set up cellular” and it just sat on the fourth step: ACTIVATION is in progress and a line is being added to your account. This may take a few minutes. Etc.

The teal circle never moved once as it had in the previous steps showing that it was in progress. I’ve reset/repaired my watch 4 times since yesterday. I spoke with an Xfinity mobile representative and they said I needed a SIM card. The watch I have is supposed to have an eSIM. Why can’t this be done on Xfinity’s end? I can’t spend another entire day working on this. Someone please help 😞