I think i have found the issue and will check when home tonight.   On the google pixel, a few menus do not work the same as on the one you buy from Verizon.   Plus, I guess the software is different. 

I had to key in one of the secret codes to see how my phone is set up.   You dial this sequence and it will enter an hidden menu.

*#*#4636#*#*

select phone info and check if VoLTE and video calling are enabled.  In my case, both were off.  Now the advanced calling is enabled and my wifi calling should work.  My Wifi calling was enabled already but did not work correctly.