Windows 11 업그레이드 후, Microsoft 계정 로그인은 되는데, Office Outlook/excel/word의 계정 로그인은 불가능합니다.

Question

환경은 Windows 10에서 11로 업그레이드한 후에, Microsoft Edge 계정에 로그인 되어 있는 상태에서, Office의 Outlook/Word/Excel 계정에 로그인이 안됩니다. 관련 로그인 오류는 다음과 같습니다.

Correlation Id: 3443c5a0-5eda-44e5-9b32-ee2fc4bee56d

Timestamp: 2025-09-22T01:41:19.000Z

DPTI: bacdc8636f62cc4e87ddf58294da8b227181bbba2d6c41c79de6ea4db8fcc0b6

Message: An unexpected error occurred.

Tag: 7q6ca

Code: 2147483661

Answer 1

Thank you for the details and for trying the previous steps. Since those did not resolve the issue, the next recommended approach is an in-place upgrade of Windows 11, followed by a full Office reinstall. This process can repair system components that Office 2019 relies on for sign-in and activation, such as Microsoft Account services and network authentication components. Don't worry, this won't affect any of your apps and files.

Here’s how you can proceed:

⦁ Uninstall Office 2019 completely using the Microsoft Support and Recovery Assistant to ensure all licensing and residual files are removed.

⦁ Download the latest Windows 11 ISO from Microsoft’s official site.

⦁ Mount the ISO (right-click > Mount) and run setup.exe from the mounted drive.

⦁ Choose Keep personal files and apps when prompted and complete the in-place upgrade.

⦁ After Windows finishes upgrading, reinstall Office 2019 using your original installer and license.

⦁ Try signing in to Office apps again.

This combined method of a clean Office uninstall plus an in-place upgrade addresses both corrupted system components and licensing files, which are common causes of post-upgrade sign-in failures.

Answer 2

Hi,

Thanks for bringing this up. I understand how frustrating it is. I’ll help you sort this out.

Before we proceed, I need to clarify a few details first:

• Are you using Microsoft 365 subscription apps, or a standalone version like Office 2019/2021?
• When you open Word/Excel, do you get prompted to sign in each time, or does it just fail with the error code and message?
• Do you have multiple Microsoft accounts on the device (work/school and personal)?
• Have you confirmed the account works by signing in at portal.office.com?

In the meantime, here are steps you can try:

Step 1. Clear stored credentials

Close all Office apps.

Open Credential Manager by searching for it in the Start menu.

Under Windows Credentials, remove entries related to MicrosoftOffice or your email.

Restart your PC and try signing in again.

Step 2. Update Office

Open any Office app > File > Account > Update Options > Update Now.

If this fails, run the Microsoft Support and Recovery Assistant to repair sign-in issues:

Step 3. Reset Office sign-in state

Press Win + R, type:

%localappdata%\Microsoft\Office\16.0\Identity

Delete the files in that folder.

Reopen the Office app and try signing in again.

Step 4. Go to Microsoft account services

Check if your Microsoft 365 subscription or Office license is listed as active.

If the wrong account is showing, sign out and log in with the correct one.

Step 5. Temporarily disable VPN, browser extensions, or firewall/security software.

If possible, test on another network, for example, a mobile hotspot.

If none of these work, try a Quick Repair of Office:

Settings > Apps > Installed apps > Microsoft 365 > Modify > Quick Repair.

Reference: Sign in to Office

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Please reply using the Add a comment option below with the answers to the above questions, so I can provide you with the most accurate next steps.