Who I have the same questioned this topic

I recently purchased a LG G6 for myself and a LG K20 (for my wife).  The LG K20 connected to wifi calling with no problems.  My LG G6 is another issue.  It would not connect to Wifi calling with the message, "Unable to activate wi-fi calling at this time.  Please try again later".  Many many many many times later since no wifi calling.  Doesn't even go to the 911 address screen.  Followed the instructions to the letter.  BTW, there is no cell service here in the hills.