Microsoft 365 Error Codes

How to Fix Microsoft 365 Network Connection Error 2604 in Excel and Word

Huda Qurayshi Oct 7, 2026 870 views

Question details

The user needs to resolve a network connection error that appears when trying to use Microsoft Word and Excel on an additional computer.

How to Fix Microsoft 365 Network Connection Error 2604 in Excel and Word

Product: Microsoft 365 (Word, Excel)
Device & OS: not provided
Scenario: Opening or activating Microsoft Word and Excel after installing Microsoft 365 on a second computer.
Observed behavior: The applications display network connection Error 2604, which prevents the user from successfully activating or using the software.

Before you start

Ensure that your computer is connected to a stable internet network and verify that you are signed into the correct Microsoft account associated with your active subscription.

Solution 1Recommended

Check Network Stability and Microsoft Service Status

Verify your local network connection and ensure there are no server-side outages causing the error.

Error 2604 is heavily tied to connectivity issues. A simple network interruption or a temporary server outage on Microsoft's end can prevent Office from authenticating your license.

Test internet connection

Open a web browser and load a few web pages to confirm your Wi-Fi or Ethernet connection is stable and active.

Restart Office applications

Close Microsoft Word or Excel completely, wait a few moments, and reopen the applications to clear any temporary software glitches.

Verify service status

Visit the official Microsoft 365 Service Status web page to check if there are any ongoing outages affecting Office licensing and activation servers.

Check Network Stability and Microsoft Service Status

Solution 2

Update and Repair Microsoft 365 Installation

Fix corrupted installation files or outdated software versions that might trigger network connection errors.

Solution 3

Reinstall Microsoft 365 and Verify Activation

Perform a clean installation to resolve deep-seated activation or configuration issues on the second computer.

Free Microsoft Office alternative

Avoid Activation Errors with WPS Office

Tired of dealing with Microsoft 365 network connection errors and subscription limits across multiple devices? WPS Office is a powerful, lightweight, and completely free alternative that does not require complex online activations to view and edit your files.

Highly compatible with Microsoft Word, Excel, and PowerPoint formats (.docx, .xlsx, .pptx).Lightweight design ensures fast installation and smooth operation even on older computers.Familiar user interface requires no learning curve for an easy and seamless migration.Free to use without encountering constant activation, connection, or subscription errors.

microsoft office alternative - wps office

Frequently Asked Questions

What exactly causes Error 2604 in Microsoft 365?

Error 2604 is typically caused by local network connectivity issues, Microsoft server outages, outdated Office applications, or software conflicts when attempting to verify a subscription on a newly added device.

Does Error 2604 mean my Microsoft 365 subscription has expired?

Not necessarily. While it relates to the activation check process, it usually points to a network connection failure that prevents your computer from communicating with Microsoft servers, rather than an expired license.

Can my firewall or antivirus trigger Error 2604?

Yes. Strict firewall rules, VPNs, or third-party antivirus software can block Microsoft 365 from accessing the internet. Temporarily disabling them or adding Office applications to your whitelist can help resolve the connection issue.

How do I remove an old device from my Microsoft 365 account to fix device limit errors?

Log into your Microsoft account online, navigate to the 'Services & subscriptions' section, find your Microsoft 365 subscription, and choose 'Manage'. From there, you can view logged-in devices and sign out of Office on specific computers to free up a slot.

Microsoft Office Error Codes