If you are using an iPad and are using the Safari browser, go into your browser settings in Safari and look for the setting called "Turn off content blockers" and check this setting. Now refresh the browser and try the webinar again.
If you are using an iPad and are using the Safari browser, go into your browser settings in Safari and look for the setting called "Turn off content blockers" and check this setting. Now refresh the browser and try the webinar again.