I've been struggling with this all day and I'm not any closer to getting it to work. I'm trying to set up a Virtual Server to host a game server. But no matter what settings I change or what ports I choose, it always fails to send a connection outside of my home network with the Public IP Address. All the other guides I've found online haven't provided any soultions. Here's a list of things I've already tried:

Adding the ports to Port Triggering

Adding the ports in Windows Firewall

Enabling DMZ

Disabling SPI Firewall (Turned it back on as soon as I saw it didn't work)

Giving my computer an Address Reservation

Rebooting the router after adding the Virtual Server

And if it matters at all I'm not using the modem given to us by the ISP (XFinity), I'm using a Motorola DOCSIS 3.1 Cable Modem Model MB8600. It only has one ethernet port and it's plugged directly into the Archer C4000. Any help I could get with this would be greatly appreciated.