Guideline 2.3.10
References to other platforms in app or metadata
App screenshots, description, or UI mention Android, Windows, or other non-Apple platforms. Apple requires the focus to be on the Apple platform experience.
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Apple's rejection message
Guideline 2.3.10 - Performance - Accurate Metadata: We noticed your app or its metadata includes references to other mobile platforms, which is not appropriate for the App Store.
How to fix this
Remove all Android/Windows references from app and metadata
easyWorked for 98%
Search your entire codebase, assets, and App Store metadata for references to Android, Google Play, Windows, or other platforms. Remove them all. Replace cross-platform screenshots with iOS-only ones.