Bluetooth headset switches to mono when starting the virtual machine

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Symptoms

Cause

This behavior is caused by a Bluetooth headset built-in feature which automatically switches from high quality stereo sound (AD2P profile) to mono (HFM) when a microphone is in use.

The feature's activation is triggered by a Windows 10 Cortana virtual assistant that is enabled by default.

Resolution

To prevent the headset from switching to HFM profile, apply any preferable workaround from the listed below:

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