By chance are they already customers in the project? Customers don’t receive a notification of being added to an org. However they do get a notification when they are invited to be a customer if that notification is configured under Project settings > customer notifications.
As far as I am aware, adding a customer to an organisation does not trigger a notification. Organisations are just a way to add a group of people to Request Participants easily, most commonly to allow multiple customers within the same organisation to see the requests relevant to their organisation.
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