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

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New Around Here
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 ISP, the DDNS is the only solution for me (not sure though, I'm a pure noob). I created an account on no-ip.org and connected my router to this account. It works fine, if I check on whatmysdns.net, the domain works and returns an IP.
The problem is, I have this message :
"The wireless router is using a private WAN IP address (192.168.x.x, 10.x.x.x, or 172.16.x.x), this router may be under a multi-layer NAT network."
Indeed, the IP on whatsmydns.net is something in 10.x.x.x.x .
I made some research, but I couldn't find a solution. All I read about multi-layer NAT network is about bridge mode supposing you have an external modem.

Also, on my domotic server which runs on Linux, I have a cron updating the public IP of my domain on duckdns.org, it works (checked on whatsmydns), but I can't reach nothing using this, the router doesn't seem to even see me when I ping the domain.

Can someone help me ? Let me know if you need any details about my conf.
And again sorry for my english :)

Edit : After some research, I finally found the answer, the problem doesn't come from the router but from the ISP. The NAT is on their structure due to a lack of IP and there is nothing I can do except waiting for IPv6 to get my own IP. I left my post if it can helps someone in the same situation.
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