Re your Bluetooth: Generally speaking, Bluetooth is reserved for peripherals (buds, mice, etc.). I wonder if you’re confusing WiFi & Bluetooth.
Regardless, does your phone pick up any Bluetooth or WiFi in range of your laptop & router?
Just another data point for troubleshooting...
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.
Or to clarify, the Bluetooth failure in my laptop is a separate issue, but it led me into this WiFi mess when I tried to go the WiFi route and set up Miracast. (I had a Miracast dongle sitting around, never used.)