How to restore missing parenthesis for passwords on iPhone?

While entering an iPhone alphanumeric passcode, the parentheses do appear when you tap the 123 key on the on-screen keyboard.

If you are unable to see them in a particular third-party app, it could be because the app’s developer has chosen to disable or remove parentheses input for passcode fields. In such cases, the limitation isn’t from iOS itself, but from the app. You should reach out to the app’s developer for clarification or to request that the feature be restored.

The app developer may not have updated their software to ensure compatibility with the iOS version your device is currently running.

If you encounter any challenges with third-party applications, the best course of action is to directly contact the app developer for further assistance. Here's a brief guide on how to do it:

1. Identify the app developer.
2. Visit their website or app store listing.
3. Look for their contact information or support channels.
4. Clearly describe the issue you are facing.
5. Provide any necessary information they may need.
6. Follow their instructions and provide feedback.
7. Be patient and follow up if needed.

By reaching out to the app developer, you increase your chances of receiving accurate and personalized support for the challenges you're experiencing. To contact an App developer --> How to contact an app developer - Apple Support

Your issue is not clear.

Does your iPhone’s keyboard not display “(“ and “)” ?

GeorgeD22 wrote:

I need them for certain passwords

where exactly, what sites?