Use Provided Upload_cert.der To Sign A Release Android APK File

I've just enrolled in the Google Play App Signing program, which required uploading an encrypted version of the release keystore and had an 'optional' step for creating an upload k

Solution 1:

The .der file you uploaded to the Play Console (and that is also available for download in the App Signing page in the Play Console) does not contain the private key, it only contains the public key, so you won't be able to sign anything with it.

Only the keystore you created to generate your upload certificate contains the private key and must be used to sign your APKs (or App Bundles).

In other words, you shouldn't create another keystore after enrollment in Play Signing, you should use the keystore you have created to generate the upload certificate to sign your future artifacts.

Hope that helps.