Outdated MS Teams: One of the major reasons for the Bluetooth headset to not work with MS Teams is that you are using an older version of the MS Teams application on Windows 10.

Check the Bluetooth settings of your device to make sure that the Bluetooth headset is both paired and connected.

Bluetooth Settings: If your Bluetooth device displays as paired but you cannot hear the audio, make sure it is connected.

Make sure that your Bluetooth device is near enough to the PC so that it can be connected easily.

Vicinity Issues: Sometimes Bluetooth devices do not work if they are not within the range of your PC.

Windows Update: If Windows updates is running under background processes then it may hinder the detection and connection of Bluetooth devices to your PC.

Outdated drivers prevent the utilization and detection of Bluetooth devices on installed applications.

Outdated Bluetooth Driver: If you are not able to use the Bluetooth headset with MS Teams then it could be an issue with the Bluetooth driver.

It is a common problem faced by many users.

Windows Sound Settings: Sometimes your headset is not selected for default audio playback in the sound settings of your PC therefore the headset does not work with MS Teams.

Bluetooth enumerator