To add some more info to what the others are saying, if your public IP address is in the range 100.64.0.0/10 (so between 100.64.0.0 and 100.127.255.255) then it is a CGNAT IP and you will not be able to make port forwarding/NAT work to/from the public internet because your public IP is not actually a publicly routable IP on the internet no matter what your ISP calls it. Hope that helps!