Unable to answer calls with headset button in Zoom VDI Client

Hello,

I have installed two different headsets for our receptionist.  A Yealink WH62 UC and a Poly Voyager 4310 UC and I have the same problem with both, the button that should be used to answer incoming calls does not work.  On the Yealink, it just made a beep when pressed and does nothing.  On the Poly, it will answer a call once, then any subsequent attempts to answer a call do not work.  On subsequent attempts, when the headset button is pressed to answer an incoming call, it sends the caller to voicemail.  

I've tried both of these headsets using the regular Windows Zoom client and they work as expected so I know that it isn't the hardware.  The Yealink headset worked fine for around two years then suddenly, it stopped.  Assuming it was a hardware problem, I recently ordered the Poly I mentioned earlier and it doesn't work either.  That tells me that this is most likely a problem with Zoom.  I'm guessing a setting was changed or an update broke this but can't be certain.  

I'd appreciate any tips or suggestions to get this working again.

Thanks.