[Webinar] Host Live Events in Microsoft 365

After setting up a Teams live event another person was invited to join as an attendee (attendee has a Teams license and permission to attend). As a producer, when loading content to share, putting to live, and then starting the event the attendee was unable to see anything other than a black screen with what appears to be a "play" button. The only other options available on the screen was to Leave the live event. This was then tested reversing roles and creating a new live event and the same black screen with a play button was presented to myself.