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I just found out that by shutting off my VPN - which was the duckduckgo app tracking feature - I was able to get the WiFi calling to work properly. I tested using the google Fi VPN and the WiFi calling does work so there was something with the duckduckgo app protection which prevented WiFi calling to work.

I just noticed last night that my WiFi Calling on my S21 Ultra must have stopped working after the One UI 4.0 update (android 12 beta) or with the new Fi app that came yesterday. I worked on my router for a bit to ensure all was well and looked at forums which indicated to try disabling VoLTE on sim 1 (didn't work) plus looked for disabling WiFi calling within the Settings app. I could not of course find it and finally did think to look in the Fi app and there it was. My specific problem was audio out to caller from my Galaxy was not working although audio in to the Galaxy was.

So for the time being it appears on this device with Samsung's radio that Goog Fi WiFi calling is not working f