No, the Bluetooth on the laptop went out, and then I tried the Miracast dongle as a way to get signal over to the TV. That’s when I ran into the IP address problem, and then trying to access (login) to my wireless router, I found that it literally cannot be located from the desktop machine, even though the router is clearly working. (See my post just above.)
It has me completely baffled - but then I’m no networking geek, and most of my real experience goes back to Win 7 or XP.
ipconfig /all under the command prompt will answer the question of your router’s IP address.
It’s step #1.
If you have internet - as I recall from your post, but I could be mistake (busy day here, too) - your router has an IP and should be accessible.