Sign-in & Login Problems

Fix Microsoft 365 Administrator Cannot Sign In After Creating a User

Maira Mehtab Sep 28, 2026 869 views

Question details

A Microsoft 365 administrator account was unexpectedly signed out and cannot log back in after creating a new user and purchasing a license.

Product: Microsoft 365
Device & OS: not provided
Scenario: An administrator recently created a new user account, purchased a Microsoft 365 license for them, and was immediately signed out.
Observed behavior: The administrator is unable to access the Microsoft 365 admin center and cannot sign back into their account.

Before you start

Ensure you have your administrator email address ready, make a note of any specific error codes displayed during login, and have a secondary device or browser available for testing.

Solution 1Recommended

Try Alternative Browsers and Devices

Rule out browser cache conflicts or device-specific network issues by attempting to sign in using a clean browser session.

Browser cache issues frequently cause login loops or authentication failures, especially after performing administrative tasks like creating users or modifying licenses.

Use Private Browsing Mode

Open a new Incognito or InPrivate window in your web browser and navigate to the Microsoft 365 admin center login page.

Clear Browser Cache

Navigate to your browser's settings menu, clear your cookies and cached data, restart the browser, and attempt to sign in again.

Switch Devices

Try logging into the admin account from a completely different device, such as a mobile phone or an alternative computer on a different network.

Solution 2

Verify Account Status with Another Administrator

If your organization has multiple administrators, a secondary admin can check if your account was locked or modified.

Solution 3

Contact Microsoft Support

When local troubleshooting fails and no other administrators are available, Microsoft Support must intervene to restore access.

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Frequently Asked Questions

Why did I get signed out immediately after creating a new Microsoft 365 user?

This can happen due to a browser cache conflict, an unexpected session token expiration, or a temporary backend sync issue when assigning the new license.

What should I do if I am the only administrator on the account and cannot sign in?

If you are the sole global administrator and are locked out, you will need to contact Microsoft Data Protection support by phone. They will help you verify your identity and regain access to your tenant.

Can a newly created user account cause the admin account to be locked?

Creating a new user does not directly lock an admin account. However, switching browser profiles, testing the new user's login in the same browser session, or triggering automated MFA enforcement during setup might cause login disruptions.

Login & Account Issues