I really need the correct ports to forward to play BF6 on Steam via PC? Please.

Hey there,

Sorry to hear you’re having connection issues. We have a port-forwarding guide you can try:
https://forums.ea.com/blog/battlefield-game-info-hub-en/infoguide-troubleshooting-connection-error-186001s---port-forwarding-guide/12881626. 

It lists the relevant ports and some helpful steps. You can also try the troubleshooting steps here:
https://help.ea.com/en/articles/technical-issues/problems-connecting-online/
or here:
https://support.microsoft.com/windows/fix-network-connection-issues-in-windows-166a28c4-14c1-bdb1-473c-09c1571455d8

Hope this helps!