Installing the Netflix IPA file on your iOS device is primarily used to bypass version compatibility issues on older hardware or to install the app on devices where the App Store is unavailable Method 1: App Store "Purchased" Section (No Tools Required)

When you install Netflix from the App Store, the app is signed with a specific certificate that interacts securely with Widevine. When you sideload an IPA using a free developer certificate (via AltStore or Sideloadly), the app is signed differently. Netflix’s servers often detect this unauthorized signature and refuse to stream content. You might be able to open the app and browse titles, but hitting play will often result in an error (typically Error: -14 or similar).