Hi there! I understand you're having trouble with the Australian ETA app where the selfie outline never turns green, despite trying different backgrounds and adding more lighting. Let's see if we can get this sorted out.

Just to clarify a couple of things before we proceed:
- Are you using the front camera on your Mac to take the selfie, or are you transferring a photo taken elsewhere?
- Is the app running on your Mac, or are you using another device?
- Have you ensured that the selfie photo meets the app’s requirements? For example, a plain, light-colored background that's not white, no patterns or objects, and that your face is centered in the frame.
- Are you running the latest version of the app?

Here are some steps we can try to resolve the issue:

1. Background and Positioning: Even though you've tried different backgrounds, ensure the background is plain and light-colored but not completely white. The app may have trouble detecting your face against a very bright or patterned backdrop. Also, align your face within the frame carefully—sometimes the outline won’t turn green if your face is not positioned properly.

2. Camera Permissions: Check that your app has permission to use your Mac’s camera. To verify on macOS Catalina:
- Open System Preferences > Security & Privacy > Privacy tab > Camera.
- Ensure the app is allowed access to the camera.

3. Lighting: While you've tried more lighting, try to avoid harsh shadows or overly bright or dim conditions. Indirect, diffuse light often works best.

4. Use Another Device: Sometimes the app can be picky with camera input on Macs or certain devices. If you have access to a smartphone, that might be an easier option to take and upload your selfie.

5. Image Size and Quality: The app sometimes struggles with very high-resolution images. If you’re uploading a photo rather than taking it live, try resizing or lowering the resolution slightly.

6. Restart and Reinstall: Close the app completely, restart your Mac, and then try again. If the problem persists, try uninstalling and reinstalling the app.

7. Check Network Connection: While this usually affects uploading rather than the outline detection, ensure your internet connection is stable.

If after these steps the outline still doesn’t turn green, it may be a technical issue with the app itself. Some users have reported similar issues where the app doesn't accept photos despite multiple attempts 1 2.

If needed, you can reach out directly to AustralianETA support through their email: [email protected] for more specific assistance.

Would you like me to guide you through any of these steps in detail? Also, please let me know your Mac setup regarding camera use and how you’re capturing your selfie, so I can tailor advice accordingly.