The target space set for Copy Space is not linked to the target space set in the space publishing configuration for the space.
What is copied?
Copy Space can be configured in the space settings Copy Space dashboard to include
pages, blogposts, top-level pages
The copy action can also be set to include
labels, content properties, scaffolding data, version comments
You can also choose to match labels on content in each space, delete any content found in the target space, copy page restrictions and replace source space references in the copied content to target space references.
The content to be copied is configured separately to the space publishing configuration options
Who can use Copy Space?
To copy a space you will need to
have space admin permission in the space you want to copy
have at least View, Edit and Delete permission for pages, blog posts, and attachments in the target space
to be a member of the Confluence user group added to the Copiers Group in the Copy Space - global configuration