What have you tried to fix it?
Does it work other places
It may be your carrier experiencing problems
Reboot both iPhone and watch
Forget network and re-sign in
So your work's IT department has WiFi calling blocked and you asking why WiFi calling doesn't work?????Just tested it at home with my iPhone off and it worked great. The problem is they have WIFI Calling disabled at work so the watch won’t take or send calls when on WIFI.