I had a lot of difficulty last year converting my pre-paid AT&T sim to e-sim and again this year just transferring my e-sim. The tool to transfer the e-sim wouldn't work so I had to call again. He added all of the phones info to my account but it was stuck on the "activating" even though it showed as active on his side.
My steps from last year worked again this year. When it's activating, forget the wifi network and restart the phone. Reconnect to wifi. If it still doesn't work, restart the phone again. Worked the 2nd time for me.
Here's the original post from last year
https://forums.macrumors.com/thread...-to-esim.2359663/?post=31499661#post-31499661