As a workaround you can downgrade Word via
https://macadmins.software/
You can download and install the 15.40 update to Word from the above website.
You can find a list of steps for Word 2016 Troubleshooting on our website:
https://support.clarivate.com/Endnote/s/article/EndNote-X8-Mac-and-EndNote-online-Mac-CWYW-tools-in-…