The ways to fix Word 2010/2013/2016/2019 cannot complete the save due to a file permission error on Mac are the same as those on Windows computer. Restart your Mac and Word. Uninstall and reinstall Microsoft Office Word for Mac. Gain or change the ownership on your Mac.
How do you fix Microsoft Word Cannot complete the save due to a file permission error?
Select File > Get Info. In the Sharing & Permissions section, click the Action (gear) icon and choose Apply To Enclosed Items. (If the Sharing & Permissions section isn't showing, click its triangle. If the gear is grayed out, click the lock icon and enter an administrative password.)
Why is Word saying I don t have permission to save on Mac?
Quit Word app from dock bar and then open Finder > press Command + Shift + G > input ~/Library/Containers, remove Microsoft Word(or com. microsoft. Word in Catalina) folder to desktop. Then, restart Word to check if the save/close action will be faster.