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I have stumbled upon a solution that, while not ideal, certainly is effective. 

Install xcode via the terminal app with the following:  xcode-select --install 

Once you've got that enabled, type the following command into Terminal.app: sudo codesign --remove-signature /Applications/RingCentralMeetings.app/

Team,

Kindly remove the existing RingCentral Meetings (RCM) App and install the RCM Logging version here then replicate the issue. Please collect the app logs and screenshot then send it to RC Support  so we can have our Dev/Product team investigate the cause of the issue and provide a permanent fix. Installing the older version of RCM is an option but not recommended. 

You can download the older version of RCM here.

I'm having this same problem. Have tried reinstalling the current version of Meetings and no luck; it still can't find my camera. Have been looking for a download link to reinstall the one version of Meetings prior to the current one, but cannot find it anywhere. (I'm also on a Mac). Can anyone help to provide a link to this?

Hello Jerry,

Apologies, can you uninstall the app and reinstall it? 

Get the app from here.
Thanks!