I have also the same Problem, on all the our Devices there is no inventory Record of the esim Phone Number. Is this a bug and will there be a fix in the near future?
The answer I got from Jamf Support was:
"
My name is Meganne and i'll be helping out on this case today. Unfortunately it looks like we are experiencing a product issue, known as PI-009538, that is preventing the eSIM numbers from displaying. I have attached it to the case here, and we can check the release notes in upcoming Jamf Pro versions for updates on PI-009538. I'm really sorry for the inconvenience this is causing, we are working on a solution for this!"
A little disappointing since there is no expected resolution date for the bug. More disappointing was the suggestion that I monitor the update notes for future releases to identify if the one in question was resolved. I suppose it would be too difficult to add a list of names / emails to the work order and notify those people who expressed concerns about it when resolved. Ah well. Jamf solves so many other issues that I'm willing to be a little flexible on this.
At least you now know that you aren't going crazy, there is a bug and Jamf know about it; they just don't have a good idea of when they will fix it yet.