Install the Video conferencing clients needed for the "Meet Now" feature:
Zoom
Microsoft Teams
Cisco Webex
Google Meet
Configure the Video conferencing clients as follows:
Sign-in with a valid account
Enable silent auto-start (in background)
Check the default microphone, speaker and camera settings
Make a first test of all video conferencing clients (eg Meet Now functionality) and disable unnecessary notifications (eg select the "Do not show again" flags)