You chose to record your sessions and upload them as pre-recorded. How can you test if the embed code is entered correctly? Or if you entered the correct ID for your video provider?
In your Event Organiser account, navigate to Content> Talks.
If your talk is all setup, you should see the option to Preview Page.
If you still have to add some information to your session, you can find this option by clicking on the ... next to your talk.
After clicking on the Preview Page, you will see your talk in preview mode. Click on Broadcast View, to see your session as your attendees would when the session goes "live."
Please note, as an Event Organiser you will see the play and pause option but your video will auto-play for your attendees.
Also, this test only works on pre-recorded sessions since live sessions haven't occurred yet, you will only get a message saying "Your video is on its way."