AlwaysON VPN IKEv2 access from Apple MAC (Mojave)

Anybody has any ideas how to access IKEv2 AlwaysON VPN server (Server 2019) using Apple MAC?

Trying this:

https://www.oxcrag.net/2018/08/24/ikev2-ipsec-vpn-with-pfsense-and-apple-devices-2/

but there seems to be no way to specify anywhere -AuthenticationTransformConstants SHA256128 -CipherTransformConstants AES128 (which are configured on my server). Yes, I have correct certificate imported in login keychain on Mac

I only get User Authentication failed. error when trying to connect

This does not help much at all!

https://docs.microsoft.com/en-us/mem/intune/configuration/vpn-settings-ios#ikev2-settings

Neither did this:

https://docs.microsoft.com/en-us/azure/vpn-gateway/point-to-site-vpn-client-configuration-azure-cert

This is also of no @value@ here, because it talks about Catalina (and I do use Mojave)

https://social.msdn.microsoft.com/Forums/en-US/ed4b9407-5a6a-4155-bc94-7353bc76296d/macos-catalina-ikev2-vpn-client-to-azure-vpn-gateway-incompatibility?forum=WAVirtualMachinesVirtualNetwork

Seb