Wifi calling not working after one ui 4.0 upgrade

[Gops24]

Iam using unlocked Samsung S21 ultra bought in USA. After UI 4.0 upgrade, iam unable to use VoLTE and WiFi calling. 

Can anyone help me to resolve this problem?

[Gops24]

Thank you for the steps. I tried and it didn't fix the issue. So I sent feedback as mentioned in the steps

[APS999]

A service configuration update has come today which has fixed this issue for me and a few others.

[Gops24]

I didn't receive any updates yet.

[APS999]

You should get it soon. I got it just before noon. Another person got in the morning.

[Gops24]

I got an update now and could access VoLTE and wifi calling