It looks like you have set this to localhost so I am not too sure how to test this. Is the site accessible publicly so that we can test this?

Hi Mark, unfortunately it's localhost and not live yet.

I have found out that if I login to the frontend of the website I'm able to preview in the backend. However if I logout of the frontend I can no longer preview in the backend.

Is that normal behavior?

Thanks

Ah yes, that is the correct behavior. Because when you click on the preview, it actually routes you to the front end. You can't really preview a post at the back end since your back end doesn't load the same template as the front end. The post is only visible to you and not everyone.

Thanks for the clarification, makes perfect sense

You are most welcome Jonny