Port forwarding through Advanced>NAT Forwarding>Port Forwarding has been doing nothing. I used multiple port checkers but still the port is not open. I did all the steps on: https://www.tp-link.com/us/support/faq/785/

AND on:

https://www.youtube.com/watch?v=2tIUts0fyFk

but to no avail. The port is still not open.