Hi there! Sorry to hear your Powerpay app won’t open even after deleting and reinstalling it and restarting your iPhone. Let's try to get to the bottom of this together.

A few quick questions first:
1. When you try to open the app, does it crash, freeze on a loading screen, or just not respond at all?
2. Are you able to log into Powerpay Self Service from a browser on your iPhone (like Safari)?
3. Do you know if your employer has enabled the Self Service feature for employees? Without that, the app won’t function properly.

Meanwhile, here’s a step-by-step approach we can try:

1. Check for App Updates: Sometimes the app needs an update to run smoothly on newer iOS versions. Go to the App Store, tap your profile icon, and scroll to see if Powerpay Self Service has an update available.

2. Verify Internet Connection: Confirm your iPhone has a stable internet connection through Wi-Fi or cellular data since the app requires online access.

3. Try Logging in via Browser: Open Safari and navigate to https://clients.powerpay.ca/selfservice/login to see if you can log in successfully from there. This can help isolate if the issue is app-related or account-related.

4. Clear Cache/Data (if possible): Although iOS apps don’t have a direct "clear cache" option like Android, you can try restarting your phone again after reinstalling the app to ensure no residual data is causing conflicts.

5. Check for iOS Updates: Your device is on iOS version 18.6.2—if there’s a minor software update available, install it, as sometimes app compatibility improves with the latest iOS patches.

6. Verify App Permissions: Go to Settings > Powerpay Self Service and ensure it has the necessary permissions enabled (like network access).

If none of these steps work, you might want to confirm with your HR or payroll department that the Self Service feature is active on your account, as the app only works for those who have this enabled1 2.

Try these out and let me know what happens or if you notice any error messages. I’m here to help you through it! Are you satisfied with the solution I provided so far?