Some Mac Apps have code signatures that may prevent you from using VCam as a virtual camera. However, it is possible to remove these code signatures to enable the use of virtual cameras for selected applications.
This workaround has been tested to work on Discord, Amazon Chime, Zoho Meeting, and WhatsApp (Mac App versions only)
sudo codesign -f -s - /Applications/Discord.app/Contents/Frameworks/Discord\ Helper\ \(Renderer\).app/
or try this code if the one above does not work:
sudo codesign --remove-signature "/Applications/Discord.app/Contents/Frameworks/Discord Helper (Renderer).app"
sudo codesign --remove-signature "/Applications/Slack.app”
sudo codesign --remove-signature "/Applications/Slack.app/Contents/Frameworks/Slack Helper.app"
sudo codesign --remove-signature "/Applications/Slack.app/Contents/Frameworks/Slack Helper (Renderer).app"
sudo codesign --remove-signature "/Applications/Slack.app/Contents/Frameworks/Slack Helper (Plugin).app"
sudo codesign --remove-signature "/Applications/Slack.app/Contents/Frameworks/Slack Helper (GPU).app"
sudo codesign --remove-signature "/Applications/Amazon Chime.app"
sudo codesign --remove-signature "/Applications/Zoho Meeting.app"
sudo codesign --remove-signature "/Applications/Zoho Meeting.app/Contents/Frameworks/Zoho Meeting Helper.app"
sudo codesign --remove-signature "/Applications/WhatsApp.app"