Date: June 16 2021
Issue: Mac Keynote presentation audio was not heard when screen sharing in Zoom.
During the issue Zoom was displaying an Unencrypted audio warning.
When the presenter checked the Zoom audio settings, they discovered that their external condenser mic (EpocCam microphone) was selected for the speaker.
The corrective measure was to set the “Select a Speaker” to “Same as System” option. This allowed the audio to be heard by the other participants.
As a preventative measure, the Tech Host may want to have presenters check their Zoom audio settings. If in doubt about which speaker to select then use the "Same as System" option.