Hit the website ipchicken.com It will tell you what the internet sees your IP as. Then compare it to the one you see on your Peplink dashboard. If they are the same, then you have a public IP and it’s just a matter of changing settings. If they are different, then it becomes very complicated.
As a note, I’m a fellow Xbox gamer and you can achieve open nat now with just port 3074 UDP, nothing else is needed anymore :-). I had all those same rules in my peplink for 4 months and had logging turned on… only one port is used now. The change appears to have been made in 2017 so you can have multiple Xboxes in one household.