MFA & Verification Issues

Fix Microsoft Authenticator Repeated Sign-In Prompts in Office 365

Kushani Nimanthika Sep 28, 2026 869 views

Question details

Users are continually prompted for MFA authentication in Microsoft 365 despite configuring a 30-day sign-in period.

How to Fix Microsoft Authenticator Repeated Sign-In Prompts in Office 365

Product: Microsoft Authenticator
Device & OS: not provided
Scenario: Accessing Microsoft 365 apps and third-party integrations like Concur that require multi-factor authentication.
Observed behavior: The system ignores the 30-day session lifetime and repeatedly prompts the user to authenticate. Reinstalling apps and clearing caches does not resolve the behavior.

Before you start

Since local troubleshooting like reinstalling the app does not fix this issue, you must have your organization's Microsoft 365 administrator investigate server-side policies in the Microsoft Entra admin center.

Solution 1Recommended

Review Conditional Access and Session Lifetime Policies

Ask your IT administrator to review authentication logs and adjust organizational security policies that are overriding your session lifetime.

Repeated sign-in prompts are typically caused by server-side configurations such as conflicting Conditional Access policies, changes in device compliance status, or strict session lifetime enforcement in Microsoft Entra ID.

Check Microsoft Entra Sign-in Logs

The administrator should log into the Microsoft Entra admin center, navigate to 'Identity' > 'Monitoring & health' > 'Sign-in logs', and review the user's logs to identify which policy is interrupting the session.

Review Conditional Access Policies

Under 'Protection' > 'Conditional Access', the admin must verify if specific policies are enforcing a stricter sign-in frequency than the intended 30-day period.

Verify Device Compliance Registration

Ensure the user's device is properly registered and compliant in Microsoft Intune. A device falling out of compliance can trigger continuous MFA prompts.

Inspect Third-Party App Configurations

Because the issue affects external apps like Concur, the administrator should verify the Enterprise Application settings and token lifetimes for those specific integrations.

Review Conditional Access and Session Lifetime Policies

Contact Microsoft Support: If policies and logs show no anomalies, the administrator should open a support ticket with Microsoft Support or the application provider (e.g., Concur) for deeper diagnostic assistance.

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Frequently Asked Questions

Why didn't reinstalling the Microsoft Authenticator app fix the issue?

Reinstalling the app only clears local app data. If the continuous prompts are driven by organizational security policies or server-side session settings in Microsoft Entra, local client troubleshooting will not resolve the issue.

Can a network change trigger repeated Microsoft Authenticator prompts?

Yes. If your organization's Conditional Access policies are location-based, switching between networks (like moving from the office to a home Wi-Fi or using a VPN) can invalidate your current session and require you to re-authenticate.

How do I find out who my Microsoft 365 administrator is?

Your administrator is typically your company's IT helpdesk, the system administrator, or the person who provided you with your work email address. You can usually find their contact information in your company's internal directory.

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