Has Wifi Calling broken again (Oct 2026)

I'm not sure if it's has anything to do with my recent switch to an eSIM (it probably doesn't) but I don't seem to be able to get Wifi Calling working on my iPhone 18 Pro today.  I've tried restarting, switching to other wifi networks, checking for carrier updates, toggling Wifi Calling off and on again, disabling my 2nd (physical) SIM, everything I can think of.  My O2 physical SIM is connecting with Wifi Calling but my SMARTY eSIM is flat out refusing.  Is this a widespread issue or is something screwy with my iPhone?