Why OBB file is not downloading from play store?

Development Platform & Builds Mobile
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Why OBB file is not downloading from play store?
Please heeeeeeeeeeeeeeeeelp. I have been reading for hours and no solution yet.

  1. I have my APK (ETC2) and OBB file uploaded into google play for Beta testing.
  2. Before packaging “projectname.keystore” was generated and copied to “Projectname\Build\Android” and “Projectname\Build\ Android_ETC2(just for testing to see if it would fix the issue)” .
  3. Before packaging confirmed “disable verify OBB on first start” in unchecked.
  4. Before packaging was also Distribution signing is also completed
    Now, when I download the app and try to open it I get this error:
    No google play store key:No OBB found and no Store key to try to download.
    Are any of these setting needed for OBB to download?
  5. In UE4 project settings/Android developer page on signing for distribution
    Where it says “enable google play support”,” game app id”….
  6. File Ekspansi APK  |  Developer Android  |  Android Developers
    Downloading the Expansion Files
    In most cases, Google Play downloads and saves your expansion files to the device at the same time it installs or updates the APK. This way, the expansion files are available when your application launches for the first time. However, in some cases your app must download the expansion files itself by requesting them from a URL provided to you in a response from Google Play’s Application Licensing service.

The basic logic you need to download your expansion files is the following:

When your application starts, look for the expansion files on the shared storage location (in the Android/obb// directory).
If the expansion files are there, you’re all set and your application can continue.
If the expansion files are not there:
Perform a request using Google Play’s Application Licensing to get your app’s expansion file names, sizes, and URLs.
Use the URLs provided by Google Play to download the expansion files and save the expansion files. You must save the files to the shared storage location (Android/obb//) and use the exact file name provided by Google Play’s response.
Note: The URL that Google Play provides for your expansion files is unique for every download and each one expires shortly after it is given to your application.

Thank you for your help