Did you find any solutions to this problem? I am having the exact same issue: I have tried different styles, have copied the document text into a new document, but still I am unable to use any of the options in the ‘Configure Bibliography’ dialogue… I can apply styles to the bibliography manually in Word, but this has to be done every time I ‘update citations and bibliography’, and is not a workable solution for me. I am also using Office 2016, but am up to Endnote X8.2 on Windows. I have even tried repairing my installations of both Word and Endnote, to no avail. Suggestions very welcome!