GL-iNet AX1800 Xbox won't connect to router with vpn

Hi, first of all sorry for my english… hope you can understand what i’m saying. So here is my problem every devices in my house connect to my router with no problem but my xbox won’t connect with ethernet or wifi when the vpn is on

I tried this : Open these network ports for Xbox One - Microsoft Support

But it doesn’t work… and i put my xbox to DMZ zone it doesn’t work too. I updated the router to the last firmware so i don’t understand where come from the problem ? When i start my xbox and i go to internet they say “UPnP fail” but i think xbox doesn’t need UPnP when the network port is open maybe i’m wrong ?.. Idk

I see this post : Flint GL-AX1800 uPnP release 4 and ps4 i think we have the same problem but with the last firmware there is not “UPnP” section on the router

When you put to DMZ zone upnp should not matter.

Sorry don’t have an xbox to give suggestions.