The problem with the chat during the webinar

Hello. Today, we had a webinar. There was an issue where I, as a co-organizer, was responding to messages, but no one could see them because I only had the 'Organizers and Presenters' option. The 'Everyone' option was unavailable to me. Another colleague initially had the 'Everyone' option, but it disappeared later. Could you please explain why this happened and how we can prevent it in the future?