Audio output via HDMI does not wo…
https://answers.microsoft.com/en-us/windows/forum/all/audio-output-via-hdmi-does-not-work/ac5004af-f835-405b-9832-33579cbd73ff
Right-click the Volume icon by the time in the lower-right corner. Click Playback Devices. The Sound window opens. On the Playback tab, click Digital Output Device (HDMI) if it is listed. If it is not listed, click Realtek HDMI Output. Click on Start, then search for Control Panel. In the Control Panel, select Hardware and Sound. Click on Sound. Select your Realtek device and set it as default.
Right-click the Volume icon by the time in the lower-right corner.
Click Playback Devices. The Sound window opens.
On the Playback tab, click Digital Output Device (HDMI) if it is listed. If it is not listed, click Realtek HDMI Output.
Click on Start, then search for Control Panel.
In the Control Panel, select Hardware and Sound.
Click on Sound.
Select your Realtek device and set it as default.
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