If you can create an account in the app, you need to be able to delete an account from the app too. Starting June 30, 2022, apps submitted to the App Store that support account creation must also let users initiate deletion of their account within the app. - from Offering account deletion in your app. The App Store Review Guidelines also state this is required in section 5.1.1(v), under Privacy > Data Collection and Storage > Account Sign-In. If your app supports account creation, you must also offer account deletion within the app.
Topic:
App Store Distribution & Marketing
SubTopic:
App Review
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