Answer Reviewed Notification doesn't show Variable content from the Internal interface

Summary:

Our Answer Reviewed Notification is using the wrong interface when generating the email so the variables do not display in the Answer 'Solution' section of the notification.

Content (required):

At this stage all our variables are created in our Internal interface, is there is a default setting that we can change so the review notificatoin is selecting the variable from the correct interface?

Version (include the version you are using, if applicable):

Knowledge Foundation

Code Snippet (add any code snippets that support your topic, if applicable):