If you’ve ever tried opening an iOS app and encountered the “Untrusted Enterprise Developer” error, you’re not alone. This issue commonly happens with apps signed using an Enterprise Certificate rather than being downloaded directly from the App Store.
In this article, we’ll explain:
- What the error means
- Why it happens
- How to fix it step by step
- How to avoid this issue using a trusted enterprise signing service like ninjaiossign.com
The “Untrusted Enterprise Developer” warning that appears when trying to open an enterprise app
When you encounter this error, you’ll typically see a message like “Untrusted Enterprise Developer” followed by the developer’s name, with options to “Cancel” or “Settings.” The app won’t launch until you manually trust the developer certificate.
What Is the “Untrusted Enterprise Developer” Error?
Starting with iOS 9, Apple introduced an important security feature that blocks apps not installed from the official App Store. These include:
- Enterprise apps signed with an Enterprise Certificate
- Beta versions of apps in testing
- Sideloaded apps installed outside the App Store
- Corporate or internal apps used within organizations
- Development builds installed directly from Xcode
When you install such an app, iOS won’t let you open it until you manually trust the developer certificate.
Why Does This Error Appear?
The error occurs mainly for these reasons:
- The app was signed with an Enterprise Developer Certificate.
- The developer hasn’t been verified by Apple’s App Store review process.
- The certificate is new and hasn’t been trusted on your device yet.
- Apple revoked the certificate due to misuse.
Quick Fix: How to Trust the Developer
Follow these steps to remove the “Untrusted Enterprise Developer” error on iOS:
- Open the Settings app.
- Go to General → VPN & Device Management.
- Under Developer App, tap the name of the developer.
- Select Trust [Developer Name] and confirm.
- Return to your home screen and open the app again.
Now the app should launch without any issues.
Common Problems & Solutions
- No VPN & Device Management Option → Reinstall the app and check again.
- Developer Not Listed → Restart your device and wait a few minutes.
- Trust Button Grayed Out → Ensure no restrictions or profiles are blocking it.
Preventing the Error in the Future
While you can manually trust apps, the best way to avoid constant certificate issues is to use a reliable iOS enterprise signing service. Apple frequently revokes certificates that are misused, causing apps to stop working.
That’s where ninjaiossign.com comes in.
- ✅ Stable iOS Enterprise Certificates
- ✅ Fast app signing & installation
- ✅ No jailbreak required
- ✅ Perfect for beta apps, business apps, or private distribution
With a trusted enterprise signing service, you don’t have to worry about your apps being blocked or certificates getting revoked unexpectedly.
Final Thoughts
The “Untrusted Enterprise Developer” error is Apple’s way of keeping iOS devices secure, but it can be frustrating if you’re installing legitimate apps outside the App Store.
By following the steps above, you can fix the issue quickly. And if you want a long-term solution with stable enterprise certificates, check out ninjaiossign.com — a professional iOS signing service that keeps your apps running smoothly.