Hi @NeedHelpWithPF . If the router's LAN ip address is 192.168.1.1, you must forward to a local ip address of 192.168.1.x. The device should have a fixed local ip address so it can always be found by forwarding rule.
This router has 3G/4G backup. Forwarding may not work if this is your connection.
Can you attach a picture of the forwarding rule getting the error?