Where to I put my app specific password
Where will I use my app specific password I am never asked for it
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App-specific passwords are used for 3rd-party (non-Apple) apps. For example, if you want to use the Microsoft Mail app on a Windows PC to connect to your iCloud email. You enter the app-specific password in that Mail app where you would normally enter your Apple ID password.
Also see the following from Sign in to apps with your Apple ID using app-specific passwords - Apple Support
App-specific passwords allow you to securely use your Apple ID to sign in to apps made by developers other than Apple.
Some apps made by developers other than Apple ask you to sign in with your Apple ID, so that the app can access information like mail, contacts, and calendars that you store in iCloud. To help make sure that your Apple ID password can't be stored or collected by the app, you can choose to create an Apple ID password to use only with that app.
You use this app-specific password when the app asks you to sign in with your Apple ID.