I get the following errors when clicking on an object in the diff report:
Unable to compare objects.
Ensure that you have the required permissions.
You must own the objects or have select_catalog_role.
But the user of the specified connections in the first window of the database diff tool is the owner so I'm unsure why I'm getting this. As a side note, the specified user does not have select_catalog_role; if this is required then the given error is misleading (because it says one or the other)...