4G-AC68U double nat issue - Can't access from outside

Hi everyone,

First I'd like to apologize for my english and if this topic had already been discussed. I couldn't find anything about the 4G-AC68U.
I have this router since 2 years, it works fine.
Here is my configuration :
1/ Using 4G slot only (double-wan disabled)
2/ 2,4ghz and 5ghz WiFi enabled
3/ DHCP enabled with 2 entries (plex server and domotic server)
And I think that's all I did.

I'd like to access to my network from outside :
Considering that I have a dynamic IP address from my...

4G-AC68U double nat issue - Can't access from outside