Author: Katie Hightower

CSU students, faculty, and staff may have seen warning messages during Duo Multi-Factor Authentication (MFA) logins. These alerts are part of a university-wide effort to improve cybersecurity—and they’re a signal to update your device or browser now. 

During Duo authentication, users will see warnings if their device or browser needs an update. These warnings will continue until enforcement begins for that device type.  Once enforcement begins, Duo will block access from outdated systems entirely. 

In addition, the Duo Mobile app on mobile devices also needs to be up to date. Duo Mobile should update automatically via the iOS App Store or Google Play Store on supported mobile OS versions.  

Key dates and impacted systems 

On Feb. 2, 2026, Duo will deny access from: 

• Unsupported operating systems: Windows 7, Windows 8, and Windows 8.1. 
• Outdated browsers used to initiate or approve Duo authentication. 
• Outdated Duo Mobile app (below 4.85.0) 
  • If Duo Mobile is not up to date by Feb. 2, users will no longer receive Duo Push notifications. 
  • Users can still open the app and generate passcodes but push approvals will stop working. 

This applies to any device used to log in or approve Duo pushes, including computers, phones and tablets. 

On August 31, 2026, Duo will deny access from: 

• Windows 10 

Important: After these deadlines, users on unsupported systems or browsers won’t be able to authenticate with Duo and will lose access to certain university systems—including email, NetID tools, and administrative applications. 

What you need to do 

• If you are receiving warnings from Duo, make plans to update your operating system and browser if needed to avoid disruptions. 
• The Duo Mobile app should update automatically via the iOS App Store or Google Play Store on supported mobile OS versions. Action will be required if users have manually turned off automatic updates for that application. 

Helpful resources

• How to check your browser version and update if needed 
• Find out what your device’s operating system is and update if needed 
• If your device cannot support an upgrade, review your options for replacing unsupported devices.

Acting now helps ensure uninterrupted access to CSU systems and keeps our community secure. Learn more about what to expect with these changes: Duo MFA Requires Updated Devices. 

Submit a ticket to the Division of IT if you have questions or need assistance.