Wifi-Calling Not Working At Home

My wifi-calling works with any network except at home. I can go to my neighbors or a store with wifi and turn my mobile data off and still make calls. If I try at home nothing happens no error no “Please connect to a network” nothing it just doesn’t work. I can’t text or call. I’ve been back and forth with both my ISP as well as my carrier and neither can figure out why it won’t work at home.