Lync does not recognize audio device.

I have a Dell E6540 and Lync (office365) gives a message that it does not recognize an audio device.
things I have tried
1) update Bios
2) update all drivers using Dell command update and Dell drivers update page
3) delete drivers so that it has to reload them
4) check microphone settings under sound
5) make sure power management is not turning the audio device off
6) plug in external head set (I would prefer if the factory installed microphone worked instead)

Hi jakesz28,
Please check if there’s a
WiDi USB Intel Wireless card is installed.
If this is the case, open Device Manager then disable the
Intel UoIP Bus and Host Controller.
Have a look at this article,
http://www.dell.com/support/article/us/en/cndhs1/SLN293338/zh
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability
of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
Best regards,
Eric

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Lync does not recognize audio device.

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