Hi there,

Neither the deprecated D365 Marketing nor the new D365 Customer Insights - Data will create new contacts in D365 Customer Insights - Journey. However, this is unreasonable to our customers. They request Microsoft product team can allow this happen, or at least offer a switch to let the customer use this feature with their control.

Source: https://learn.microsoft.com/en-us/dynamics365/customer-insights/journeys/customer-insights-segments#customer-insights---data-segments-wont-create-new-contacts-in-customer-insights---journeys

Please take it seriously.

Thank you,

Derek