Hi, I'm having a brand new Deck X50 5G and I'm trying to open the ports on my Xbox Series X, but I'm unable to do so. I've done everything I should have to do but it still says strict. What am I doing

I recently cancelled my fibre subscription and instead purchased a TP-Link Deco X50-5G mesh router. Very satisfied with overall performance so far but I have one big issue. My mobile connection ISP (T