How made a VPN under NAT

RouterOS Beginner Basics
1

Hi, Please help on these situation. Im rookie.
My Device:
Model: Ltap mini LTE kit
OS: 6.42

Already setup: VPN (enable IP CLOUD), PPTP and LTE sim card

But have th followin error: DDNS server received request from IP 201.227.226.144 but your local IP was 10.168.40.200; DDNS service might not work.

i cant connect to my address
############.sn.mynetname.net

2

Your ISP is using CG-NAT and you will have big problems with any port forwarding.

3

Thats right.

Any one know a service or script to work over these situation.

Any idea.

4

The solution is to get public IP address, from this ISP or from another. Or in worst case, from some tunelling service.