Hey rbuserdl
It’s solved now! The problem was different IP of VPN address from public IP, so it couln’t communicate. I contancted internet provider - TMobile and they gave me username and a password to APN to make ip static (previosly it was dynamic). Then I went to WebFig>Interfaces>LTE>LTE APN’s and I added a new. Value of APN is now data, “Use Network APN” disabled and in authentication I picked CHAP and entered username and pass which TMobile gave me. In the moment I did this public ip address changed and VPN address is the same as public so the problem disappeared and I managed to make L2TP / IKEv2 VPN connections.