Hi! I understand that when you try to scan a QR code using the Ente Auth app on your iOS device, the screen goes black. Let's work through this together to get it fixed.

First, can I confirm the model of your iPhone or iOS device? Also, is the Ente Auth app up to date and do you have the latest iOS updates installed? This info will help me tailor the solution.

In the meantime, here are some straightforward steps you can try to resolve the black screen during QR scanning in Ente Auth on iOS:

1. Toggle QR Code Scanning Setting
Go to your iPhone's Settings > Camera and find the option called Scan QR Codes. Disable it, then restart your phone, and enable it again. This has helped many users resolve black screen camera issues1.

2. Check Camera Permissions for Ente Auth
Go to Settings > Privacy > Camera and make sure Ente Auth has permission to access the camera. If not, enable it and try scanning again.

3. Restart the Ente Auth App
Fully close the app by swiping it up in the app switcher, then reopen it and try scanning again.

4. Reinstall the Ente Auth App
Sometimes reinstalling the app resets its configurations and permissions. Delete Ente Auth, then reinstall it from the App Store.

5. Restart Your Device
A simple restart clears temporary glitches in camera behavior.

If after these steps the issue persists, let me know and I can guide you through some advanced checks or configurations. Does this make sense so far? Are you able to try any of these steps now?