No WiFi Calling on FP4

Hi there,
I own a FP4 for some weeks now with the latest ROM update… I can’t get WiFi Calling working and I’m really disappointed about that.
On my old Xiaomi Mi A1 running LOS 18.1 WiFi Calling worked like a charm. Using the same SIM (Telekom Germany) in my FP4 there’s only VoLTE available. I think that there’s something wrong with the integration in FP’s ROM, as there’s no choice whether to prefer WiFi or cellular network (as in LOS).
Anyone successfully used WiFi Calling here?
Regards, M.

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