FIX: 'Another account from your organization is already signed in on this device' when activating Microsoft 365 apps (Office 365).
If you unable to activate Microsoft 365 apps or to sign-in to an Microsoft 365 app due to error "Another account from your organization is already signed in on this device.", then in this guide you will find some effective solutions to fix the problem.
Issue: When a user tries to sign-in to any Office 365 application to activate it, the login/activation fails with error "Another account from your organization is already signed in on this device. Try again with a different account".
Cause: The described error is usually caused when you try to sign in to a Microsoft 365 application that was previously signed in (activated) using a different account. (For example, when you try to log in to O365 apps on a device that was previously used by another user).
How to fix Microsoft 365 Activation error "Another account from your organization is already signed in on this device".
Method 1. Sign-out from other accounts in Office apps.
The first method to fix the "Another account from your organization is already signed in to this device" error is to sign out of other Microsoft accounts from any Office app.
1. Open any Office 365 app (e.g. Word) and from File menu select the Account tab.
2. Click Sign out to sign-out from any other MS account. (If there is no linked account, continue with the next method).
3. Restart the application, and when prompted, sign-in using your Microsoft account credentials.
Method 2. Remove & Add Microsoft Account in Settings.
The second method to fix the reported activation error in Office 365 apps, is to disconnect any Microsoft account in the Windows "Accounts" settings and add only your own account.
1. Go to Start > Settings > Accounts > Access work or school.
2. Click on your Microsoft account (or anyone else's) and click Disconnect.
3. When done, do one of the following:
-
- Click the Connect button on the "Access work or school" screen to connect your MS account again and re-register the device by going through the sign in process.
- Open any Microsoft 365 app and follow the prompts to sign-in to your Microsoft account.
Method 3. Remove cached Microsoft account information and credentials.
One of the most efficient methods to solve the reported sign-in error in Office 365 apps, is to delete all folders in the following locations to clear the cached credentials.
- %localappdata%/Microsoft/OneAuth
- %localappdata%/Microsoft/IdentityCache
To navigate to these locations:
1. Press the Windows + R keys to to open the "Run" command box.
2. Type the following command and press Enter:
- %localappdata%/Microsoft/OneAuth
3. Press CTRL + A to select all files and press the Delete button to remove them.
4. Now, press the Windows + R keys again, type this command and press Enter:
- %localappdata%/Microsoft/IdentityCache
5. Press CTRL + A to select all files and press the Delete button to remove them.
6. Now restart your PC and open any Microsoft 365 app to check if the problem persists.
Method 4. Uninstall & Reinstall Office apps.
The final method to fix the mentioned error is to remove and reinstall Microsoft Office apps.
1. Close all Office programs.
2. Visit Microsoft 365 troubleshooters page, expand Microsoft 365 uninstall troubleshooter and click the Start button.
![image_thumb[10]](https://www.wintips.org/wp-content/uploads/2025/04/image_thumb10-1.png "image_thumb[10]")
3. Then choose Open on the message says "This site is trying to open Get Help".
![image_thumb[16]](https://www.wintips.org/wp-content/uploads/2025/04/image_thumb16.png "image_thumb[16]")
4. Then click Yes to uninstall Microsoft 365 or Office.
![image_thumb[15]](https://www.wintips.org/wp-content/uploads/2025/04/image_thumb15-1.png "image_thumb[15]")
5. When the uninstall is complete, restart your computer.
6. Finally, proceed to install Microsoft Office again.
Additional Help:
If, after following the methods above, you are still encountering the error, create a new user profile and check if the error appears there. Also, take a look at this Microsoft article, which has some additional instructions even for Mac users.
That's it! Which method worked for you?
Let me know if this guide has helped you by leaving your comment about your experience. Please like and share this guide to help others.
Frequently Asked Questions
What causes the Microsoft 365 activation error, 'Another account from your organization is already signed in on this device'?
This error is typically caused when trying to sign in to a Microsoft 365 application already signed in (activated) with a different account, possibly from a previous user.
How can I resolve the error message 'Another account from your organization is already signed in on this device'?
There are multiple solutions including signing out of other Microsoft accounts from Office apps, removing and re-adding Microsoft accounts in Windows 'Accounts' settings, clearing cached credentials, and uninstalling and reinstalling Office apps.
How do I sign out of other accounts in Office apps to fix the activation issue?
Open any Office 365 app, select the File menu, go to Account, and click Sign out from any other Microsoft accounts. After signing out, restart the app and sign in with your Microsoft account credentials.
What steps should I take if clearing cached credentials doesn't resolve the activation error?
If clearing cached credentials doesn't help, try uninstalling and reinstalling Office apps or creating a new user profile to check if the error persists.
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