Hi and thank you for responding.  However, I think I worded my issue poorly.  I want to do the opposite from what you said: I want to use Facetime over my home WiFi.  I want to disable using Facetime on cellular while I have access to WiFi.

I do use WiFi calling and that works fine, so it is not an issue of my phone accessing my WiFi.  I just can't find any option to limit Facetime to WiFi only.