Not Allowed

I have no problem getting this to work with “latest” but I need to get latest only by one author. When I add that filter I get a response that says:

Sorry, you are not allowed to access this page

There is restricted content on this site but number one it has a very particular page blocker set up, nothing set to block it like this, and number two, I’m attempting to access it from an account that is allowed to see it.

I just retested and discovered I get this response for ALL authors whenn I try to use this filter.

The page I need help with: [log in to see the link]