Another part of the issue is the Xs showing service but not being able to actually do anything.
Just like in real estate, location location location. Many live in an area with excellent coverage and will never have an issue, even if the phone has one.
I live on the edge of a dead area and the phone was useless at my house, even with WiFi calling. I boxed it up and returned it and back to my X. I loved the xs max but what can you do.
WiFi calling uses WiFi....so how does your location have anything to do with your WiFi calling not working?