I got message from apple
how to solve this ?? Try make iosapp

Guideline 5.1.1(v) - Data Collection and Storage

We noticed that your app supports account creation but does not include an option to initiate account deletion.

Apps that support account creation must also offer account deletion to give App Store users more control of the data they've shared while using your app.

Next Steps

To resolve this issue, revise your app to include an option to initiate account deletion.

If you are unable to offer account deletion due to legal requirements, reply to this message in App Store Connect and provide additional information. You must follow all legal requirements where your app is available for storing and retaining user account information and handling account deletion. If you have questions regarding your legal obligations, check with your legal counsel.

Keep these requirements in mind when updating your app to support account deletion:

Only offering to temporarily deactivate or disable an account is insufficient.
If users need to visit a website to finish deleting their account, include a link directly to the page on your website where they can complete the process.
You may include confirmation steps to prevent users from accidentally deleting their account. However, only apps in highly-regulated industries may require users to use customer service resources, such as making a phone call or sending an email, to complete account deletion.

Resources

Review frequently asked questions and learn more about the account deletion requirements.