Why can't I forward ports on Windows 10?

I had a problem that could not be solved: Why does my OS want to open all URL files with the same program? so I reinstalled my OS and that fixed the problem yet created another. Before the reinstall I had Win 10 Pro Build 1809 and all ports forwarded perfectly; now I have Win 10 Pro 1909 and I cannot get any ports to forward with the firewall disabled. The only thing that has change is my Windows build number and I assume a bit of stuff within the Windows architecture. My Linksys AC1900 Router still has the ports forwarded (26900-26905) so that's not the problem, the firewall is disabled, and I can't think of what else would be blocking communication. Maybe it has something to do with going from IPv4 to IPv6 and something getting lost in the translation... idk. Please help.

I think more information is needed. What services are you running that need to be accessed, for instance...

I am playing 7 Days to Die and the following ports must be open for a dedicated server to work: 26900-26905, 8080-8082, and 8090. I have Windows 7 installed with all the necessary up to date drivers, the game, the server manager, and Kaspersky Internet Security (which I have tried shut on/off).

So is it a Win7 or Win10 machine??? Also, make sure the Firewall in KIS is disabled, not only the AV portion of it.

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You can also try this to help the troubleshooting process:
Open Port Check Tool -- Verify Port Forwarding on Your Router

wow, i was very tired when i replied, it's win 10 - my apologies. i've been at this problem for way too many hours

To be clear you have forwarded ports on the router to the win10 pc which has a fixed IP not using DHCP and how are you testing for open ports as you can't test on the local network you must use a different internet IP

I reinstalled my os to fix a problem, that one is out the way... but it created a freaking MONSTER. So I've come upon some new details, I think it has to do with error 1231.
From my pc:
I found this article and followed the directions with no luck:
Here's how to fix Ping general failure error on Windows 10

Ping uses ICMP "echo request" packets, and ICMP does not use port numbers so you cant ping a port