samsung galaxy s9 wifi calling via Voxi not working

[RosieE88]

I have joined Voxi from another network on a SIM free samsung galaxy S9 however there is no wifi calling or VoLTE been displayed to say there is such service, I have made sure the options have been ticked for both WIFi Calling and VoLTE but with no luck, However i have the same issue with Virgin Mobile on a iPhone 8 what uses the Vodafone network so not sure if is an actual Vodafone or my ISP Zen?
Im with Zen Internet with fibre with a Fritzbox 7590 what they provided and i cant see any issue why it would be blocked in anyway?

Ping test to bbc.co.uk

rosie@dellxps15:~# ping www.bbc.co.uk
PING www.bbc.co.uk (212.58.237.252): 56 data bytes
64 bytes from 212.58.237.252: seq=0 ttl=53 time=7.623 ms
64 bytes from 212.58.237.252: seq=1 ttl=53 time=7.140 ms
64 bytes from 212.58.237.252: seq=2 ttl=53 time=7.288 ms
64 bytes from 212.58.237.252: seq=3 ttl=53 time=7.320 ms
64 bytes from 212.58.237.252: seq=4 ttl=53 time=7.824 ms
64 bytes from 212.58.237.252: seq=5 ttl=53 time=7.268 ms
64 bytes from 212.58.237.252: seq=6 ttl=53 time=6.955 ms
64 bytes from 212.58.237.252: seq=7 ttl=53 time=7.399 ms
64 bytes from 212.58.237.252: seq=8 ttl=53 time=7.189 ms
^C
--- www.bbc.co.uk ping statistics ---
9 packets transmitted, 9 packets received, 0% packet loss
round-trip min/avg/max = 6.955/7.334/7.824 ms

I have also following the guide for wifi calling here https://deviceguides.vodafone.co.uk/samsung/galaxy-s9-android-8-0/calls-and-contacts/turn-wi-fi-call... but nothing.

[Mark]

Hey @RosieE88 We'll need to access your account to make sure both 4G and WiFi calling have successfully been included in your services. As we've no access to your account through our Community, please pop us a private message through Facebook or Twitter so we can check for you.