Remove notification email issue

It sounds like you're trying to remove a notification email associated with your dad's Apple ID, but you're encountering some difficulty. Here are some steps you can try to resolve the issue:

1. Make sure you are logged into the correct Apple ID on your dad's device. Sometimes, there might be multiple Apple IDs associated with different services on the same device. Go to Settings > [Your Name] (at the top) > Name, Phone Numbers, Email and ensure the correct email is selected under the "Reachable At" section.
2. Ensure that you are using the correct Apple ID credentials when attempting to make changes. Sometimes, if you're using a different Apple ID, the system won't allow you to modify certain settings.
3. Ensure that the device has a stable internet connection. Some changes to Apple ID settings might require an internet connection to properly sync and apply the changes.
4. Make sure that your dad's device is running the latest version of iOS. Sometimes, issues can be resolved by updating to the latest software version.
5. If your dad's Apple ID has two-factor authentication enabled, you might need access to a trusted device to make changes to the account settings. Verify if this is the case and follow the two-factor authentication steps.
6. Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.
   1. Restart the device. That's it.
   2. Still not solved --> Force restart iPhone - Apple Support
7. If the issue persists, you can try resetting all settings on your iPhone. This will not erase your data but will reset all personalized settings to their default values. Go to Settings > General > Transfer & Reset > Reset > Reset All Settings and confirm the action. Note that you will need to reconfigure your settings afterward. All settings—including network settings, the keyboard dictionary, the Home screen layout, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted.
   1. Reset All Settings: Return iPhone settings to their defaults - Apple Support:- Return iPhone settings to their defaults
   2. You can return settings to their defaults without erasing your content.
   3. If you want to save your settings, back up your iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
8. Make sure you have the latest updates installed.
   1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
   2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

If none of the above steps resolve the issue, it is recommended to reach out to Apple Support or visit an authorized service center for further assistance. They can provide specific guidance based on your device model and iOS version.