Here are several suggestions that might help you. It is reported that some users encounter the problem “Miracast on Windows 10 not working” sometimes. What Can I Do If Miracast on Windows 10 Not Working Right now, you can press Win + P to configure both the Miracast on Windows and the display. After that, you can enable the Miracast on Windows 10 successfully. Then wait for the displays to appear in the list. Now select the Connected devices on the left tab and click on the Add a device on the right side. Inside the Settings window, navigate to the Device and double-click it. Right-click on the Start menu on the bottom left of your PC, and select Settings. If not, you need to connect the external displayer with the HDMI port of the TV and power it on.

If your TV or projector comes with built-in Miracast support, just turn it on.

Find the Wireless Display entry in the list of the installed optional features and select it.Read More How to Enable and Use Miracast on Windows 10.

To Remove Miracast Wireless Display from Windows 10 and Remove the Connect App, Later, you can easily remove the installed Wireless Display feature along with the Connect app. This will also restore the Connect app shortcut in the Start menu. Select it and click on the Install button.Find the ' Wireless Display' optional feature you need to install in the list under Add a feature.

Click on the button Add a feature at the top of the next page.

On the right, click on the link Optional features.

To Remove Miracast Wireless Display from Windows 10 and Remove the Connect App, To Add Miracast Wireless Display to Windows 10 and Install Connect App,

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