OneDrive for Mac: Files open in "read-only" or "enable edit mode"

When opening a file in Office 2016 for a Mac application (Excel, PowerPoint, Word), the file opens in read-only or enable edit mode. In the open app, an Office365 account is not signed in. Signing into an account generates the error message: "Another account from the same organization is already signed in."

To switch accounts, please go to Applications/Utilities/Keychain Access, clear all entries including the 'Office' keyword, and then restart the app.

Step-by-Step

To resolve this issue, use the Keychain Access app to delete any password entries that contain "Office." To do this, follow these steps:

1. Start the Keychain Access application.
2. In the Search field, type Office.
3. Delete any entries that are found. Note: You should find between two and six entries.
4. Exit the Keychain Access app, and then try to sign in to Office 2016 for Mac again.

External Resources

• See How To Remove Office License On A Mac for further information.