After inviting a guest on screen you'll see a prompt stating that they're waiting and connecting. The majority of times your guest speaker will appear on screen within a few seconds. However, if within 20-30 seconds you don't see your guest on screen after sending them an invite, these are the things you should check.
Ensure your guest did click accepted to enable their camera and mic.
They may have accidentally rejected the pop up to allow access to the camera and mic and will need to exit the event, refresh the browser and try again.
Ensure another application is not using the camera and mic (check Zoom, Teams, Skype, FB Messenger, etc).
Please ensure they do have a connected and operational webcam.
They might need to check in the browser settings to give permission for the camera/mic to be shared (on a Mac, specifically check for the Catalina update having affected the security settings).
At a global level, their computer might not be allowing the camera/mic to be shared. They should check in their settings to ensure this is not the case.
If they are on a Chrome browser (as we recommend) a Chrome extension could be interfering with the operation of the camera and mic.
Some antivirus software does not allow permission to the camera and mic.
Check that a firewall is not interfering with permissions. We recommend going through the advanced tests portion of our setup page.