No Cakewalk playback during a Zoom session

[Sven]

 I just tried to do my first Zoom meeting with Cakewalk involved and Zoom worked fine except for playing back Cakewalk audio.  I'm using my old Windows 7 machine with a  PreSonus AudioBox USB 96 box.

I normally have my audio driver on ASIO but changed it to WASAPI Shared for the Zoom meeting.  Then neither I nor the Zoom meeting person could hear Cakewalk.  The guy knows Zoom pretty well but we still weren't able to configure Zoom and/or Cakewalk to hear audio the DAW.    (We set Zoom to "Pro Audio users")

I know there is an app like ASIO Link Pro I can try if necessary.   The Zoom guy also suggested other 3rd party software options.  My question is does anyone know why it didn't work today with WASAPI Shared?  I used that before to record a ScreenPresso video with Cakewalk and it worked fine.  I would rather avoid having to use 3rd party software if I can.  

Thanks.