Guideline 2.3.1
Hidden or undocumented features
App contains features not disclosed in the description or App Review notes, or features that are revealed only after certain conditions are met.
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Apple's rejection message
Guideline 2.3.1 - Performance - Accurate Metadata: Your app includes hidden features or functionality that were not disclosed to App Review.
How to fix this
Disclose all features in App Review notes and description
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Document every feature in your app description. For features behind flags or conditions, explain them in App Review notes. Provide instructions for reviewers to access all functionality.