Thank you for reaching out and sorry for the trouble.
As Microsoft Office Word does not appear under the supported formats, please confirm if the application is installed on the machine or not.
If that is not the case, please check Acrobat preferences settings. In Acrobat, go to Edit > Preferences > Convert to PDF. Then scroll the list of options provided at right. Check Microsoft word is available as an option in the list or not. Check the screenshot below: