There are a few different messages you might get regarding attaching a federal return to the state. Some examples are:
Complete information must be made for Federal Copy Requirements.
Copy of Federal Return: You have selected the option to "Attach the federal XML created in the federal organizer", but the federal XML is not qualified. Create a qualified federal XML or select the option to "Attach a federal XML created just for state"
Federal Copy Requirements: Enter FEIN, Locator or Binder Number or Account Number.
This happens when a qualified XML copy of the federal return isn't attached to the state return.