Office 365 Apps Activation Error

Error: Another account from your organization is already signed in on this computer

Note: This error is expected if you're already signed in by using another Microsoft 365 account from the same tenant.

Mac Devices

1. Close all Microsoft 365 apps.

2. Open Terminal, and then run the following command:

   defaults write com.microsoft.Word ResetOneAuthCreds -bool YES

3. Open the Microsoft Word app and continue with the activation steps.

4. If the issue persists, try the steps in Can't sign in to an Office 2016 for Mac app.

Windows Devices

1. Sign out of all Microsoft 365 apps, and then sign in again.

2. If the issue still occurs, modify the OneAuth account store on the device:

   1. Navigate to the %localappdata%\Microsoft\OneAuth\accounts folder. You'll see one <GUID> file, or multiple files that have different GUIDs if there are multiple accounts.

   2. Open the files by using Notepad, examine the account_hints value, and identify the files that aren't associated with the account that you want to use to sign in.

   3. In each file that's identified in step b, locate the association_status entry, change the association status of com.microsoft.Office to disassociated, and then save the file. For example, change "association_status": "{\"com.microsoft.Office\":\"associated\",\"com.microsoft.Outlook\":\"associated\"}" to "association_status": "{\"com.microsoft.Office\":\"disassociated\",\"com.microsoft.Outlook\":\"associated\"}".

   4. Try to sign in again.

3. If the issue persists, sign out of all Microsoft 365 apps, remove all folders in the following locations, and then sign in again:

   • %localappdata%/Microsoft/OneAuth

   • %localappdata%/Microsoft/IdentityCache

4. If the issue persists, try the additional troubleshooting methods.

Using Tools

The solution is to use this tool : https://office-reset.com and select the following option

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REFERENCES

• https://learn.microsoft.com/en-us/office/troubleshoot/activation/another-account-already-signed-in
• https://office-reset.com/