Gaming Help (Xbox series X)

Hello so my NAT type is essentially closed and i’ve been trying to change it to open. I’ve tried port forwarding but that didn’t work. So I found out there’s a setting on https://10.0.0.1 i’d have to change but for some reason it claims that my login I use on Xfinity is incorrect. The login located on the back of the modem doesn’t work as well.

Any tips or advice? (I’ve tried resetting the modem and console multiple times).