I setup a webinar with @Keef to review the issue that he was experiencing. I was able to assist him in resolving this issue and his journey is now functioning correctly.
For the benefit of others, here's what to try if you experience the error message when publishing an Interaction:
Event.xxxxxx.xxxxxx cannot be used in the Interaction Defaults email list. Event key does not correspond to the interactions entry event key.
In @Keef's case there were a couple of root causes:
The Event Source Data Extension had been added to an Attribute Group and there was no Population created. We deleted the Event Source DE from the Attribute Group (it doesn't need to be there) and we created a Population (formerly known as a 'root relationship' in earlier versions), linking a Data Extension containing all Contacts to the Contact Key of the Contact Record.
Channel Address Order
Ensure that one of the following has been configured:
- The Email Address from your Event Source Data Extension is added as a Channel Address Order in Contact Builder (from the Contacts Configuration page) or,
- In the Settings page for the Journey, select
EMAIL ADDRESS FIELDS FROM ENTRY SOURCE as the Primary Email address.