So I managed to get co-authors working on the front/back end.
The issue I am having is on my site we have different profile templates for certain users. The original profile template works fine and one post will show up on both of the authors profile page. However this second version which is basically the same template is not showing the post on the co-authors page.
Is this something to do with the plugin not being able to work with different templates? Or is this theme related?
Thanks for reading.