How to Fix the Microsoft 365 Account or Device Sign-In Warning

When managing Microsoft 365 and Office | Subscription, account, billing | For home | Windows, local authentication tokens can sometimes become deeply corrupted. This corruption causes the application to reject valid credentials, triggering the endless login loop and the yellow warning triangle. Simply logging out or reinstalling the software doesn't remove these stubborn hidden cache files. Understanding this underlying token

Understanding Why "There's a problem with your account or device. Let's Fix it" Occurs

When managing Microsoft 365 and Office | Subscription, account, billing | For home | Windows, local authentication tokens can sometimes become deeply corrupted. This corruption causes the application to reject valid credentials, triggering the endless login loop and the yellow warning triangle. Simply logging out or reinstalling the software doesn't remove these stubborn hidden cache files. Understanding this underlying token issue is the essential first step to properly fixing the "There's a problem with your account or device. Let's Fix it" error without wasting hours on ineffective generic fixes

The workflow begins at a specific Microsoft 365 entry point: Close all running Microsoft Office applications (Word, Excel, OneNote, etc.)

to Fix "There's a problem with your account or device. Let's Fix it" (Manual Cache Clear)

Work through the following the Microsoft 365 Account or Device Sign-In Warning sequence in Microsoft 365, beginning from Microsoft 365 workspace.

1. Close all running Microsoft Office applications (Word, Excel, OneNote, etc.)
2. Open File Explorer on your Windows PC
3. Click on the View tab at the top and check the box for Hidden items to reveal hidden system folders
4. Navigate to this exact menu path: C:\Users\[Your User Name]\AppData\Local\Microsoft
5. Locate the folder named IdentityCache , right-click it, and select Delete
6. In the same Microsoft folder, open the OneAuth folder
7. Select the folders named blobs and accounts , and delete both of them. Restart your computer and log back into Office

Automated Alternative for "There's a problem with your account or device. Let's Fix it"

• Download the Microsoft Support and Recovery Assistant (SaRA) tool from the official Microsoft Support domain.
• Run the downloaded installer and open the SaRA application.
• On the main dashboard, select Office & Office Apps and click Next.
• Select the specific issue button labeled "Office Sign-in Resolves Office sign-in problems" .
• Follow the on-screen prompts to allow the tool to automatically clear your broken credentials and reset the login state.

How to Verify the Microsoft 365 Result

Run the final check exactly as described: Select the folders named blobs and accounts , and delete both of them. Restart your computer and log back into Office If it fails, return to Microsoft 365 workspace and confirm that Locate the folder named IdentityCache , right-click was applied to the intended item.

WPS Office: A Free Microsoft Office Alternative for the Microsoft 365 Account or Device Sign-In Warning

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For local work related to the Microsoft 365 Account or Device Sign-In Warning, WPS Office is a free Microsoft Office-compatible alternative. It does not change Microsoft accounts, subscriptions, tenant roles, licenses, or cloud-service settings, so complete the Microsoft-side procedure above first.

For the local work surrounding “the Microsoft 365 Account or Device Sign-In Warning,” WPS Office can handle DOCX, XLSX, PPTX, CSV, and PDF files. WPS AI can draft, rewrite, summarize, translate, and organize local content. The interface is lightweight and familiar to Microsoft Office users, which makes moving routine local work straightforward without changing the Microsoft-side setting discussed here.

Microsoft 365 FAQs About the Microsoft 365 Account or Device Sign-In Warning

Why does my Office app keep asking me to log in even after I enter the correct password?

This occurs because the local hidden cache storing your authentication tokens (IdentityCache and OneAuth) has become corrupted. Even with the correct password, the software reads the broken token and triggers the login prompt again. Deleting these specific folders forces the app to generate a fresh, working token.

Will reinstalling the software fix the yellow triangle account error?

No, it will not. Standard uninstallation processes do not remove the temporary AppData caching folders. When you reinstall the app, it simply reconnects to the same corrupted "blobs" and "accounts" folders, causing the exact same error to appear immediately.

Is it safe to delete the IdentityCache and OneAuth folders on Windows?

Yes, completely safe. These folders only store temporary login data and authentication tokens. Deleting them will not delete any of your actual Word documents, Excel spreadsheets, or OneNote notebooks. The applications will recreate healthy versions of these folders the next time you sign in.

What should I do if the Microsoft Support and Recovery Assistant (SaRA) doesn't work?

If the automated SaRA tool fails to clear the bug, you must use the manual file deletion method. Ensure all Office background processes are closed via the Windows Task Manager, then navigate to C:\Users\username\AppData\Local\Microsoft to manually delete the IdentityCache and OneAuth subfolders.