To enable Google Meets two Firewall rules and some web exceptions required:
Rule 1
Allow TCP & UDP ports 19302:19309 outbound to anywhere.
Rule 2
Allow outbound access to Google Meet's IP range (74.125.250.0/24) on any port
Web Exceptions
^([A-Za-z0-9.-]*\.)?youtube-nocookie\.com/
^([A-Za-z0-9.-]*\.)?youtube\.co\.uk/
^([A-Za-z0-9.-]*\.)?googlevideo\.com/
^([A-Za-z0-9.-]*\.)?ytimg\.com/
^([A-Za-z0-9.-]*\.)?youtube\.com/
i.e standard YouTube exceptions plus the nocookie one.
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