Help opening port with Xfinity Gateway

Please describe the issue you are having in as much detail as possible:
I’ve got pretty much everything for the server done, except opening the ports. I’ve followed EVERY youtube tutorial but it just does not work. Anyone else have xfinity and have been able to open a port?
Please provide any evidence or demonstrable content of the issue:

I’ve been having the same issue I’ve been trying to get my server going for a couple days now but every time my friend tries to join it says connection failed