Hi there! I understand you're getting stuck in a loop where the app keeps asking you to hit the CAPTCHA button over and over when trying to log in. That can certainly interrupt your progress.

To help you better, could you tell me if this is happening right when you open the app to log in, or after entering your credentials? Also, are you connected to Wi-Fi or cellular data when this happens? Sometimes network settings can affect CAPTCHA behavior.

In the meantime, here are some steps we can try on your iPhone (iOS 18.5):

1. Clear Safari cache and website data: Since many apps use Safari’s web engine internally, old cookies or cache might cause issues.
- Go to Settings > Safari > Clear History and Website Data, then confirm.

2. Restart your iPhone: A quick reboot can refresh system processes and network settings.

3. Check Date & Time settings: Ensure your device is set to automatic time zone, as incorrect time can cause authentication problems.
- Go to Settings > General > Date & Time and enable Set Automatically.

4. Try switching networks: If you're on Wi-Fi, try switching to cellular data (or vice versa) to see if it’s a network-related issue.

5. Update the app: Make sure you have the latest version of the MTM Link Member app installed, as updates often resolve known bugs.

If you've already tried any of these steps, please let me know so I don't repeat them and we can move on to more advanced options. Does any of this sound doable to you? Also, are you using the official MTM Link Member app or accessing the service via a browser?

I'll stay here to help you until we get this fixed!