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Yes! You will have to send each itinerary invite separately with each email. This is important because each traveler will get their own code to access the itinerary on the Trip Plans app. This is how you will be able to tell which person is chatting in the messenger.
When the participants are in the chat, you and the rest of the travelers can chat and each traveler will have a name next to their message so that you know who's chat belongs to which person.