Sign-in & Login Problems

Fix Microsoft 365 Desktop Sign-in Window Turning White and Closing

Algirdas Jasaitis Oct 1, 2026 868 views

Question details

The Microsoft 365 desktop application sign-in window crashes or loops, displaying a blank white screen before closing unexpectedly.

How to Fix Microsoft 365 Desktop Sign-In Window Turning White and Closing

Product: Microsoft 365
Device & OS: Windows
Scenario: Attempting to sign in to Microsoft 365 desktop applications on a laptop.
Observed behavior: The sign-in window opens to a blank white screen, briefly shows 'Just a moment,' and then closes and reopens. Reinstalling Office does not resolve the problem, but web browser applications function normally.

Before you start

Before proceeding with advanced troubleshooting, verify that your computer's date and time are set correctly, as inaccurate time settings can block secure authentication connections.

Solution 1Recommended

Run the Microsoft Support and Recovery Assistant (SaRA)

The SaRA tool is an official diagnostic utility that automatically identifies and resolves complex Microsoft 365 sign-in and authentication problems.

Authentication loops and blank sign-in screens are often caused by corrupted cached data or deep registry errors that reinstalling Office cannot fix. The Support and Recovery Assistant clears these deep-seated issues automatically.

Download the SaRA Tool

Visit the official Microsoft website and download the Microsoft Support and Recovery Assistant.

Install and Launch

Run the downloaded executable file to install the application. Once installed, open the tool from your Start menu.

Select the Issue

In the main menu, select 'Office' or 'Microsoft 365', then choose the specific option for 'I can't sign in' or sign-in problems.

Follow the Prompts

Follow the on-screen prompts to allow the tool to diagnose and apply fixes to your Office configuration.

Run the Microsoft Support and Recovery Assistant (SaRA)

Diagnostic Logs: If the SaRA tool cannot resolve the issue automatically, it will generate a set of diagnostic logs at the end of the process. Save these logs, as Microsoft Support may request them for further assistance.

Solution 2

Clear Cached Windows Credentials

Removing outdated or corrupted Microsoft credentials from your system can stop the sign-in window from looping.

Solution 3

Test with a New Windows User Profile

Creating a new Windows profile helps determine if the sign-in failure is caused by user-specific account corruption.

Free Microsoft Office alternative

Switch to WPS Office for a Hassle-Free Experience

If Microsoft 365 sign-in issues and blank screens continue to disrupt your workflow, consider switching to WPS Office. It provides a lightweight, highly compatible, and free alternative to Microsoft Office without the complicated authentication loops.

1. Download the Installer: Visit the official WPS website and download the free installation package for Windows.
2. Install WPS Office: Run the downloaded file and follow the straightforward on-screen instructions.
3. Open Your Documents: Launch WPS Office and instantly open your existing Microsoft Office files without being forced through a complicated sign-in screen.

Free and lightweight office suite with quick installationHighly compatible with Microsoft Word, Excel, and PowerPoint formatsNo complex subscription sign-in loops to access basic featuresFamiliar user interface for seamless and instant migration

microsoft office alternative - wps office

Frequently Asked Questions

Why does my Microsoft 365 sign-in screen go blank?

A blank or white sign-in screen usually indicates an issue with corrupted cached credentials, outdated Windows components, or faulty authentication tokens that prevent the application from securely communicating with Microsoft servers.

Will reinstalling Microsoft Office fix the white screen sign-in bug?

Reinstalling Office often does not fix this specific issue because the problem typically lies within Windows credentials, user profile registry settings, or network configurations, rather than the core application files themselves.

What should I do if the SaRA tool doesn't fix the login issue?

If the Microsoft Support and Recovery Assistant cannot resolve the problem, you should collect the diagnostic logs provided at the end of the scan and submit them to official Microsoft Support. You can also try creating a new Windows user profile to bypass the corruption.

Login & Account Issues