Feeback on : 30.11.55.57 (EU)

Feeback on : 30.11.55.57 (EU)
Running on H3G (Three UK)
VOLTE = Works (Did not before)
VoWiFI = Does Not work.
I have tried various combinations of options (plus disabling dual band wifi) but no VoWiFi icon appears (and the icon is enabled). Checking my router/firewall logs the phone is not attempting to connect to the VoWiFi service. If I put the sim back in my old phone VoWiFi works, so I know its not my network and VoWiFi is enabled on the Sim/Service.
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Comments
I believe @Gustav_ASUS is already in contact with you regarding this in the thread below
https://zentalk.asus.com/en/discussion/48261/volte-and-wifi-calling-on-zenfone-8