Microsoft 365 Error Codes

Fix Microsoft Office Error Something Went Wrong [2400]

Natalie Taylor Oct 9, 2026 868 views

Question details

The user needs to resolve the "Something went wrong [2400]" error message when attempting to open or use Microsoft Office and Microsoft 365 applications.

How to Fix Microsoft Office Error "Something Went Wrong [2400]"

Product: Microsoft Office 365
Device & OS: not provided
Scenario: Launching Microsoft Office applications or trying to authenticate a Microsoft 365 subscription.
Observed behavior: The application fails to open or authenticate properly, displaying a pop-up error stating "Something went wrong [2400]."

Before you start

Ensure you have your Microsoft account credentials ready, as repairing or reinstalling the software may require you to sign back into your subscription.

Solution 1Recommended

Repair Microsoft Office via Apps and Features

Use the built-in Windows repair tool to fix missing or corrupted Office files that may be causing the 2400 error.

Microsoft includes an automated repair tool within Windows that can scan for and fix issues affecting Office applications. The 'Online Repair' option is the most thorough method.

Open Windows Settings

Click the Windows Start button and select 'Settings' (the gear icon).

Navigate to Installed Apps

Click on 'Apps' from the Settings menu, then select 'Apps & features' or 'Installed apps' depending on your Windows version.

Modify the Office Installation

Scroll down to locate your Microsoft Office or Microsoft 365 installation. Click the three vertical dots next to it (or right-click) and select 'Modify'.

Run Online Repair

Choose 'Online Repair' from the prompt window and click 'Repair'. Follow the on-screen instructions and restart your computer once the process finishes.

Repair Microsoft Office via Apps and Features

Repair Complete: Running the Online Repair will often resolve background account sync issues without deleting any of your personal files.

Solution 2

Check for Office and Windows Updates

Outdated operating systems or Office software versions can trigger authentication errors like code 2400.

Solution 3

Reinstall Microsoft 365

If standard repairs fail, a clean reinstallation can resolve deep-rooted glitches tied to error 2400.

Free Microsoft Office alternative

Try WPS Office for a Hassle-Free Experience

Tired of troubleshooting subscription errors and account sync issues like code [2400]? Switch to WPS Office. It is a lightweight, fully-featured office suite that lets you create, edit, and share documents without the frustration of complex activations.

1. Download WPS Office: Visit the official WPS Office website and download the free installer for your device.
2. Install the Software: Run the setup file and complete the quick installation process.
3. Open Your Files: Double-click any existing Word, Excel, or PowerPoint file to instantly open and edit it in WPS Office.

100% compatible with Microsoft Office formats (.docx, .xlsx, .pptx).Free to use with no complicated subscription errors or mandatory cloud syncs.Lightweight design that installs quickly and runs smoothly on older devices.Familiar tabbed interface makes migrating from Microsoft Office seamless.

microsoft office alternative - wps office

Frequently Asked Questions

What exactly does Microsoft Office error [2400] mean?

Error [2400] is a general 'Something went wrong' message that typically indicates an authentication or sync issue between your installed Office applications and your Microsoft 365 account subscription, preventing the apps from launching properly.

Can a computer restart fix the Office 2400 error?

Yes, restarting your computer is highly recommended as a first step. It clears temporary files and resets background Windows services, which can often resolve temporary communication glitches with Microsoft's servers.

Will repairing Microsoft Office delete my personal files?

No. Running a Quick Repair or an Online Repair from your Windows Settings only affects the Microsoft Office application files. All your personal documents, spreadsheets, and presentations will remain completely safe and untouched.

Microsoft Office Error Codes