WNo Sound from Internal Microphone - Windows 8.1 Lync App on Lenovo Yoga 13

After upgrading from Windows 8 to 8.1 the microphone input in Lync ceased to work.
Lync correctly shows that I have both a webcam and microphone in my laptop, and both are turned on under Permissions.
I have updated all my drivers to latest available on Lenovo's website.
When I examine the microphone driver in the Device Manager, it shows that audio is being picked up and can properly route audio through to the laptops internal speakers.
The only app that appears to have a problem with the internal microphone is Lync.  For example, the YouCam application properly captures both audio and video.
Any suggestions?
Windows 8.1 64bit
Lync (from app store)
Lenovo Yoga 13
The YouCam app can properly capture audio and video.
The YouCam app can properly capture audio and video.

Hi,
Are you able to make call using this Internal Microphone? I would like to confirm if the call can be established and there is no sound from Microphone.
Please check the Audio and Video Device in Lync client option. Please also select "Before I join meetings, ask me which audio device I want to use" in Phones option so that you can choose the correct audio device for call.
Kent Huang
TechNet Community Support

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