Office Mac Sign-in Error

MS Office for Mac — Sign-in Error

Error: “Another account from your organisation is already signed in on this device. Try again with a different account.”

Solution (via Google search):

One:

• Close all Office Programs
• Run in Terminal:

defaults write com.microsoft.Word ResetOneAuthCreds -bool YES

Result

Didn’t work, the MacOS was 11.7.11 and that’s too old for auth.

Followup

This resets the OneAuth credential cache for Word specifically — if the same error shows up in Excel/PowerPoint/Outlook, the same command pattern likely applies with com.microsoft.Excel, com.microsoft.Powerpoint, com.microsoft.Outlook etc. Worth noting whether “One” implies there was a second fix option that didn’t make it into the daily note — if the first one doesn’t stick, check back with Rick for what “Two” was supposed to be.

Update 24-08-26

Same underlying cause confirmed: can’t log in because another user from the same org is already signed in on the device. Next thing to try — the official Microsoft Office Removal Tool for Mac, which clears license files more thoroughly than the OneAuth cache reset above. Given the OneAuth reset already failed once (old macOS, 11.7.11), this is worth trying next — full removal rather than a targeted cache clear.

Source: 24-08-26