Outlook Login Problems

Fix Office 365 Sign-In Loop and Outlook Disconnected Error

Rana Garcia Oct 22, 2026 868 views

Question details

Users are stuck in an endless sign-in loop when accessing Office 365 apps, and Outlook remains in a disconnected state despite extensive local troubleshooting.

How to Fix Office 365 Sign-In Loop and Outlook Disconnected Error

Product: Office 365, Microsoft Outlook
Device & OS: not provided
Scenario: Attempting to connect to Outlook and authenticate Office 365 desktop apps following a recent service interruption.
Observed behavior: Password prompts repeatedly appear or flash on the screen, Outlook shows a Disconnected status, and standard fixes like clearing credentials, rebuilding profiles, and editing the registry do not resolve the issue.

Before you start

Verify with your IT department that there are no ongoing global service outages for Exchange Online on the Microsoft 365 Service Health Dashboard.

Solution 1Recommended

Contact Your Microsoft 365 Administrator to Escalate the Ticket

Because basic troubleshooting has failed for these business accounts, the environment requires backend investigation by Microsoft Online Support to collect advanced diagnostic logs.

When standard local troubleshooting steps such as clearing the Credential Manager, rebuilding the Outlook profile, and modifying registry keys fail, the issue is often tied to tenant-level authentication token errors or backend sync issues caused by the prior service interruption.

End-users cannot resolve this on their own. It requires a Microsoft 365 Administrator to open a specialized support ticket so the engineering team can analyze the environment.

Identify your IT Administrator

Locate your company's Microsoft 365 Administrator, which is usually your IT support desk or system administrator.

Navigate to the Admin Center

Have the administrator log into the Microsoft 365 admin center using their admin credentials.

Open a Support Ticket

Go to the Support menu and select 'Help & support'. Choose 'Online Support' to create a new service request.

Provide Diagnostic Logs

Describe the flashing password prompt and disconnected status. Follow Microsoft Support's instructions to run diagnostic tools and collect the necessary environment logs for their investigation.

Contact Your Microsoft 365 Administrator to Escalate the Ticket

Admin Access Required: Only users with global or billing admin rights in your organization can open a support ticket with Microsoft for business accounts.

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Frequently Asked Questions

Why does Outlook keep asking for my password and then say disconnected?

This typically occurs due to corrupted cached credentials, outdated modern authentication tokens, or a backend sync issue between your local Outlook profile and the Exchange Online server after a service interruption.

Can clearing the Windows Credential Manager fix the Office 365 sign-in loop?

In many typical cases, removing cached 'MicrosoftOffice16' credentials from the Windows Credential Manager resolves standard login issues. However, if the issue persists after clearing credentials, it indicates a deeper tenant or environment issue.

How can I check if the Outlook disconnected issue is caused by a server outage?

Your Microsoft 365 administrator can check the Service Health Dashboard within the Microsoft 365 admin center to see if Exchange Online is experiencing an ongoing interruption or degradation.

What should I do if creating a new Outlook profile doesn't stop the sign-in loop?

If creating new profiles, resetting credentials, and applying registry fixes fail, the issue is likely tied to your specific Microsoft 365 tenant environment. You must escalate the issue to Microsoft Support via your IT admin.

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