Hello! I understand that the functions in your IOB Connect app are not working on your iPhone with iOS 18.6. Could you please share a bit more about what specific functions are not working? For example, are you having trouble logging in, performing transactions, refreshing account details, or something else? This will help me give you the most effective guidance.

Meanwhile, here are some general steps you can try to get the app functioning properly:

1. Check Internet Connection: Ensure your iPhone has a stable internet connection, either Wi-Fi or cellular data.

2. Close and Reopen the App: Sometimes, simply closing the app fully and restarting it can resolve temporary glitches.

3. Update the App: Go to the App Store and see if there is an update available for IOB Connect. Running the latest version often fixes bugs.

4. Restart Your Device: Turning your iPhone off and back on can clear minor software issues.

5. Clear App Cache/Data: Although iOS doesn’t have a direct cache clear option like Android, you can uninstall and reinstall the app to achieve this.

6. Check for iOS Updates: Your iOS 18.6 is fairly recent, but it's good to confirm you're fully updated.

7. Verify Account Status: Sometimes, certain app functions could be blocked if account or app registration needs re-verifying.

If you’ve done any of these already or the problem persists after trying them, let me know what steps you’ve taken, and I will guide you through some advanced troubleshooting or next steps.

Are you able to tell me which functions specifically are failing? That will help narrow down the issue.