I do think this process is still wonky... OK, maybe a lot wonky... Granted, I'm on Verizon, but I went through Quick Start twice, the first time activated Verizon, the second time asked if I wanted to transfer the eSIM (which failed). I was able to place calls but not receive them...it's still active!!! we went back to the 11, had the eSIM re-activated, IMEI on the account shows 11....and it still wont transfer to any phones.
When I chatted tech support, I looked at the phone config, and what was on the Verizon device page, and found that what they had on my phone for IMEI2 was really IMEI on my phone - and they expected it to be so. So I gave them the correct info, they reactivated the line. Had to reset network settings, and then it came back up. Still had cleanup of some of the old config to do, like deleting the eSIM that was misconfigured.
TL;DR - make sure that TMO sees your IMEI as IMEI and your IMEI2 as IMEI2, and no "crossing the streams" has occured.