A family of Microsoft word processing software products for creating web, email, and print documents.
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This error usually happens when Word does not have permission to save in the folder you chose. Try saving the file to your Documents or Desktop folder to see if it works. If you are saving to OneDrive, check that you are signed in and have space available. Also make sure the folder is not read-only.
If the issue happens everywhere, the next step is to repair Office from the Microsoft 365 Apps settings. Does the error appear only in one folder or in all save locations?