"Can't" is not a useful problem description. It does not say what you did. It does not say what happened when you did it. As usual, showing actual actions (commands) with their actual results (error messages, LED indicators, ...) can be more helpful than vague descriptions or interpretations.
> i cant seem to port forward. [...]
"seem"? (Note: "cant" is a word, different from "can't".)
> [...] i have no clue what the problem could be.
I have almost no clue to what you're doing or why.
> my router is: R6400v2
Firmware version? Connected to what?
Why are you doing anything with port forwarding? What is the actual problem which you are trying to solve?
