How to Fix Microsoft 365 Sign-In Error 2604: No Network Connection

To fix Microsoft 365 sign-in error 2604: no network connection, first identify the correct account, file, device, or service context. The steps below isolate the cause and apply a result you can verify.

Confirm the Account, Product, and Expected Result

Start by confirming whether the symptom affects one file, one device, one account, or the service itself. That distinction determines whether the next action belongs in the desktop app, the web portal, or an administrator console.

Quick Supported Workflow

First, confirm that the device can open microsoft.com and login.microsoftonline.com without a captive portal. Next, disable a third-party VPN or proxy temporarily and verify the system date, time, and time zone, and verify the final state before changing any backup or secondary account.

Why This Can Happen

• The wrong personal, work, school, billing, or administrator account is selected
• A license, permission, connection, file rule, or local setting does not match the requested action
• Cached credentials or an incomplete synchronization or activation state hides the current server status
• The Microsoft service or application requires a more specific control than a generic restart

How to Fix Microsoft 365 Sign-In Error 2604: No Network Connection

1. Confirm that the device can open microsoft.com and login.microsoftonline.com without a captive portal
2. Disable a third-party VPN or proxy temporarily and verify the system date, time, and time zone
3. Open Windows Settings > Network & internet > Proxy and correct any proxy configuration that should not be active
4. Close Office apps, remove stale Office credentials from Windows Credential Manager, and restart the device
5. Open Word, select File > Account > Sign in, and verify that error 2604 no longer appears

After the final step, reopen the affected app, portal, file, or account page and confirm the exact status or behavior described in the title.

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Practical Checks That Prevent a Repeat

• Record which account, app, and file owns the workflow
• Keep a verified backup before removing access, changing ownership, or replacing a local file
• Apply high-impact changes to one test item or user before expanding the scope
• Save confirmation numbers, dates, and screenshots of the final settings when they affect billing, security, or permissions

Frequently Asked Questions

Which Microsoft control should you verify when you fix Microsoft 365 sign-in error 2604: no network connection?

Confirm that the device can open microsoft.com and login.microsoftonline.com without a captive portal. Use the account that owns the file, subscription, tenant, or setting. Personal and work accounts can expose different controls.

What can hide the required product setting when you fix Microsoft 365 sign-in error 2604: no network connection?

A small test confirms the correct account, permissions, and destination before the action affects a larger set of files or users. For this topic, confirm the account type, product version, ownership, and permissions before assuming the control is missing.

What should stay unchanged while you fix Microsoft 365 sign-in error 2604: no network connection?

Keep the original file, confirmation messages, relevant account details, and any existing case or transaction number needed to reverse or verify the action. Keep the relevant backup or confirmation until you have checked the result.

Which check proves the workflow worked after you fix Microsoft 365 sign-in error 2604: no network connection?

Open Word, select File > Account > Sign in, and verify that error 2604 no longer appears. Reopen the affected app or portal and confirm that the expected status persists.