We are seeking to understand the visit behavior of each marketing channel by entry pages. However, when breaking down for example “Direct” only 40% of the visits from Direct are attributed to an entry page, the other 60% of the visits are lost. Why is this?

Greetings,I am using the "Marketing channel" dimension in AA to track information about campaigns, by breakdown the "Affiliate Marketing" channel with the "Tracking code" dimension I found out that there is an "Unspecified" category. Is this a problem with tracking codes?How Adobe recognize this tra...