Microsoft Miracast display adapter worked for me for a couple years. Suddenly I couldn’t pair from my Android device. The adapter is configured to use a PIN, and I had the correct PIN, but nothing would work. I had firmware V.2.0.8372 on the Microsoft Miracast adapter.

Use a native Windows laptop, as typical virtual machine software such as VirtualBox doesn’t provide the necessary software links to allow Miracast to work from a Windows guest OS. After a couple tries, I could connect.

1. Disable PIN and restart adapter
2. Enable PIN and restart adapter

Then the Miracast adapter again worked from my Android device as usual.

From a native Windows laptop:

1. Windows Store → Microsoft Wireless Display Adapter
2. connect to your Miracast adapter.
3. Select Firmware Update