How to Change Microsoft 365 Authentication Frequency on iPhone and Android
Question details
Users need to reduce the frequency of authentication prompts for Microsoft 365 applications on mobile devices.
- Product
- Microsoft 365
- Device & OS
- iOS and Android
- Scenario
- Accessing Microsoft 365 mobile applications and handling repeated sign-in requests.
- Observed behavior
- Microsoft 365 users are prompted to authenticate much more frequently on iOS and Android devices compared to their Windows desktops.
You must have Microsoft 365 Global Administrator or Conditional Access Administrator privileges to modify authentication session frequencies for your organization.
Modify Microsoft Entra Conditional Access Policies
Administrators can configure the sign-in frequency session controls in Microsoft Entra ID to reduce how often mobile users are prompted to authenticate.
Authentication frequency on mobile devices is typically governed by Microsoft Entra Conditional Access rather than the individual Authenticator app.
By adjusting session lifetime settings, IT admins can provide a smoother experience for iOS and Android users while maintaining organizational security.
Log in to the Microsoft Entra admin center using an account with Conditional Access Administrator permissions.
In the left-hand navigation menu, go to 'Protection', select 'Conditional Access', and then click on 'Policies'.
Click on the existing policy that affects your mobile users, or click 'New policy' to create a dedicated rule for iOS and Android platforms.
Under the 'Access controls' section, select 'Session'.
Check the box for 'Sign-in frequency', enter your desired time value (for example, 30 days), and select 'Periodic reauthentication'.
Save your policy changes and ensure the 'Enable policy' toggle is set to 'On' at the bottom of the screen.
Contact Your Organization's IT Administrator
Since authentication frequency settings are enforced at the organizational level, individual users cannot bypass them locally on their devices.
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Frequently Asked Questions
Why does Microsoft 365 ask me to sign in so often on my phone?
This behavior is typically caused by your organization's Microsoft Entra Conditional Access policies. These policies may enforce shorter session lifetimes on mobile devices or require reauthentication when switching network locations (like moving from Wi-Fi to cellular data).
Can I change the authentication frequency from the Microsoft Authenticator app?
No. The Microsoft Authenticator app only processes the login requests it receives. The frequency of these requests is strictly dictated by the administrative security policies set in Microsoft 365 or Microsoft Entra ID.
Will turning off security defaults fix frequent mobile log-outs?
While disabling security defaults removes Microsoft's strict baseline protections (which include automated session management), it is highly discouraged. Disabling this without immediately replacing it with well-configured Conditional Access policies will leave your organization's data highly vulnerable.
