You can't directly share an app password with another iPhone. App passwords are designed to be unique for each device and are not meant to be shared.
Here are some ways to achieve a similar result:
- Use Family Sharing: If you are using Family Sharing, you can share app purchases and subscriptions with other family members.
- Create a new account: You can create a new account for the app on the other iPhone and share your login credentials.
- Use a password manager: A password manager can store and manage your app passwords, allowing you to share them with other devices securely.
Remember that sharing app passwords can compromise your privacy and security. It's always best to use secure methods like Family Sharing or password managers to share app access.