MFA Security Issues

Why Microsoft Security Defaults Do Not Prompt for MFA Every Time

Tauseeq Magsi Sep 29, 2026 869 views

Question details

The user is concerned that Microsoft Security Defaults do not enforce a multifactor authentication (MFA) prompt upon every sign-in or when logging in from new devices.

Why Microsoft Security Defaults Do Not Prompt for MFA Every Time

Product: Microsoft Entra / Microsoft 365
Device & OS: not provided
Scenario: Signing into a Microsoft account protected by Security Defaults and expecting an MFA prompt every time.
Observed behavior: The system bypasses the MFA prompt on subsequent sign-ins or trusted devices due to risk evaluation, trusted sessions, and cached tokens.

Before you start

Verify that you have Global Administrator or Conditional Access Administrator privileges in the Microsoft Entra admin center to review and modify your organization's MFA settings.

Solution 1Recommended

Understand How Security Defaults Trigger MFA

Microsoft Security Defaults use dynamic, risk-based evaluation to balance security and usability, rather than requiring MFA for every single login.

Microsoft Entra Security Defaults do not guarantee an MFA prompt on every new device or sign-in attempt. The system intelligently evaluates the risk associated with each login.

Factors such as cached tokens, known trusted locations, and low-risk behavioral patterns often allow users to bypass the MFA prompt once their device establishes a secure session.

Review session risk

Understand that Security Defaults automatically assess the risk of a sign-in attempt in the background. If a login comes from a familiar device and a typical location, Microsoft considers it low risk and skips the MFA prompt.

Recognize token caching

Microsoft Entra utilizes Primary Refresh Tokens (PRTs) on trusted and registered devices. These securely cache credentials and significantly reduce the frequency of MFA prompts to improve the user experience.

Understand How Security Defaults Trigger MFA

Solution 2

Enforce Strict MFA Using Conditional Access

If your organization requires strict MFA enforcement on every sign-in, you must replace Security Defaults with Conditional Access policies.

Free Microsoft Office alternative

Document Your IT Security Policies with WPS Office

While troubleshooting and configuring Microsoft Entra MFA settings, you'll need a reliable suite to draft, edit, and share your security guidelines. WPS Office is a highly compatible, free, and lightweight alternative to Microsoft Office, ensuring seamless handling of your Word, Excel, and PowerPoint files.

1. Install WPS Office: Download and install the free WPS Office suite on your preferred operating system.
2. Draft security guidelines: Open WPS Writer to create comprehensive documentation on your new Conditional Access and MFA policies.
3. Export and distribute: Save the document and securely export it to PDF format using the built-in PDF tools before distributing it to your organization's staff.

Fully compatible with Microsoft Office formats (.docx, .xlsx, .pptx) for seamless documentation sharing.Lightweight architecture opens security logs, CSV reports, and policy documents instantly.Completely free to use with a familiar, easy-to-navigate user interface.Built-in PDF editing tools for standardizing IT security reports and compliance forms.

microsoft office alternative - wps office

Frequently Asked Questions

Why was I prompted for MFA during initial setup but not anymore?

Microsoft uses Primary Refresh Tokens (PRTs) to remember your trusted device. Once a secure session is established during the initial setup, subsequent low-risk logins from that exact device and location may bypass the MFA prompt to reduce user fatigue.

Can I force Microsoft Security Defaults to prompt for MFA every time?

No. Security Defaults are hard-coded to balance security and usability by only prompting when a risk is detected. To force MFA at every sign-in, you must disable Security Defaults and configure Conditional Access policies.

Does disabling Security Defaults remove all MFA protection?

Yes. If you disable Security Defaults without configuring an alternative like Conditional Access or Per-User MFA, your users will no longer be protected by multifactor authentication, leaving their accounts vulnerable.

Do I need a premium Microsoft license to require MFA for all users?

Security Defaults are free for all tenants and enforce MFA when risk is detected. However, if you want to create granular Conditional Access policies to enforce MFA under specific conditions or at every sign-in, a Microsoft Entra ID P1 or P2 license is required.

Microsoft Office Security Issues