Another "WebEx Cannot share Desktop or Apps" solution
The original question was for Catalina.
I'm using Big Sur, but this might be useful for other versions.
I have the Webex desktop app loaded on my MacBook Pro,
because I read that there can be problems on Linux systems when using the Webex browser app.
When I joined a Webex Meetings meeting I was unable to share my screen or apps
until I allowed both Webex and "Cisco Webex Meetings" in Security&Privacy:Privacy:
- Camera,
- Microphone
- Input Monitoring
- Full Disk Access
- Screen Recording
After each change it asked if I wanted to close and restart Webex.
I clicked Later until I had made all of the changes.
MacBook Pro 13″, macOS 11.6