NAT 1 or open NAT??

OK so, for the last couple of days I’ve been trying to get my PS4 to NAT type1 or open NAT w/e🤷🏽‍♂️ , to no avail. (on new Xfinity XB7 Gateway) I’m stuck on NAT Type 2, does anyone know how I can open up my NAT, I’ve disabled the firewall and advance security, I think I port fowarded correctly, I could be wrong because I really don’t see much of a difference, and I have the PS4 on DMZ, I’m not sure if having it both port forwarded and under dmz, if that’s messing the NAT, But either way I am stuck at not type two and I need some help trying to get it up to NAT 1 or Open, someone save me, oh yeah one more thing how do I tell if my PS4 is ? forwarded correctly