I solved this issue. Not sure if it’s a true solution or the only one, but this is what worked for me.
Sam, because you mentioned you are using company templates, I’m guessing the templates have specified approved styles and that there’s some kind of document protection that prevents users from modifying styles, like “Restrict Editing” features. This was my case. Our templates have a bibliography style, which has more granularity for line spacing than that offered by EN. However, EN wants to impose its bibliography style (EN bibliography) on any newly added citations. If you enter new references, then click “Update citations”, it seems that restricting styles that are autoupdating stops the process from continuing and chucks up that error message.
My solution: Remove all style restrictions from the document.
- Display Developer tab (if not already displayed).
- From the Protect pane, click “Restrict Editing”.
- Remove any restrictions (uncheck boxes).
- Click EN’s Update citations.