I have problems making WiFi Calls on my Huawei P40 Pro

Press the phone icon.

Press the menu icon.

Press Settings.

Press Wi-Fi Calling.

Press the indicator next to 'Wi-Fi Calling' to turn the function on or off.

Slide your finger upwards starting from the bottom of the screen to return to the home screen.

Press Settings.

Press System & updates.

Press Software update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the phone software.

Press and hold On/Off until your phone restarts.