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Sometimes, you have to set the wireless device as the audio default in Windows if it doesn't connect right away.
First, disconnect the display and then reconnect it. Then, check that the display is selected as your default audio device.
Swipe in from the right edge of the screen, and then tap Search.(If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then clickSearch.)
Enter Sound in the search box, and then tap or click Sound.
Tap or click Playback, and make sure the Miracast wireless display is selected as the default device.