I have a sendable data extension, that is coming from a salesforce report. There are contacts in the extension with email addresses. The Lead ID is mapped to the Subscriber Key. It is NOT a triggered send. It is a normal sent via a journey with the data extension as entry source. the contacts are entering the journey, but they dont get the email (they are not yet on the all subscribers list) and are not added to the subscribers list. No email to these new contacts is sent out.
First picture: this is the error in the journey. The contacts do enter the journey, but the send fails. Could there be a wrong configuration about where to pull the email from? I have added the picture below. For default email address: I would like to use Email Attribute form Entry source, but there is no Attribute to be chosen. What is the right selection for that category?