Microsoft 365 Error Codes

How to Fix Microsoft 365 Error AADSTS90014: Required Request Field Missing

Adam Davis Sep 25, 2026 872 views

Question details

The user encounters an authentication error stating that a required request field is missing when attempting to sign into Microsoft to access a shared file.

How to Fix Microsoft 365 Error AADSTS90014

Product: Microsoft 365
Device & OS: not provided
Scenario: Opening a shared file (such as a PaperDoc shared via Dropbox) that prompts a Microsoft account sign-in for access.
Observed behavior: The login attempt fails with error code AADSTS90014 ('Required Request Field Is Missing'), preventing the user from authenticating and viewing the document.

Before you start

Ensure you have your correct Microsoft account credentials available and verify that you have a stable internet connection before troubleshooting the authentication process.

Solution 1Recommended

Clear Browser Cache and Use a Private Window

Clearing out outdated cookies and cache resolves conflicting authentication tokens that often trigger missing request field errors.

Browser data can sometimes corrupt the handoff process between third-party applications like Dropbox and Microsoft's login servers, leaving out necessary authentication fields.

Open browser settings

Navigate to the settings or options menu of your current web browser.

Clear browsing data

Locate the privacy or history section, select the option to clear browsing data, and ensure cookies and cached files are checked before confirming.

Use Incognito/Private mode

Open a new Private or Incognito browsing window and attempt to open the shared file link and sign in again.

Clear Browser Cache and Use a Private Window

Quick Tip: Using a private window is the fastest way to test if your issue is caused by cached browser data without deleting your everyday browsing history.

Solution 2

Sign In Directly via Office.com

Establishes a valid Microsoft session prior to clicking external file links, bypassing third-party integration glitches.

Solution 3

Verify File Integrity and Contact Support

Necessary if the error persists, indicating a possible Microsoft Entra configuration issue or a broken file link.

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Frequently Asked Questions

What does Microsoft error AADSTS90014 mean?

This error means that the Microsoft authentication server did not receive a required piece of information (a request field) during your login attempt. It often happens when third-party apps pass incomplete login data to Microsoft.

Why do I get this error when using Dropbox?

When opening Microsoft files shared via Dropbox, the handoff between Dropbox and Microsoft's login portals can sometimes fail due to outdated cookies, strict browser privacy settings, or temporary integration glitches, resulting in the missing request field.

Do I need an IT administrator to fix error AADSTS90014?

Not usually. You can typically fix it yourself by clearing your browser's cookies or using Incognito mode. However, if the issue persists on a corporate network, your IT administrator may need to adjust your organization's Microsoft Entra ID (formerly Azure AD) integration settings.

Microsoft Office Error Codes