Are you using the IP address that your ISP gives your Modem? It should be listed on your router as Internet (or something to that affect). On my Netgear R7000 it listed under Internet.
View attachment 2064 this is what comes up at the cmd find 3889
cant understand it thoughj
Assuming that was ran on the RDP Target (Host), It means your machine is accepting RDP on 3389 and if the other screen shot is your router I don't see it accepting RDP on 3389....
If I try to change the port on the router to 3889 it won't let me. It gives the error on that other screenshot.