You might have downloaded the app from a third-party site (like an APK mirror) instead of the official Google Play Store or Apple App Store.
The app cannot verify that you "own" the license to download the additional data. You might have downloaded the app from a
Modern apps—especially heavy games like PUBG , Call of Duty Mobile , or Genshin Impact —don’t include everything in the initial APK file you download from the store. Instead, they download "Resources" or "OBB files" upon first launch. If the app sends a request to the server to get these files and the server says "I don't have them" or "I don't recognize you," the download fails. Common Causes Call of Duty Mobile