We have published a game using Defold a while ago and we recently moved it to Unity. While using Unity we have to use our Keystore file directly instead of using Certificate and a Private Key as in Defold. Now we are getting attached error while uploading our Unity build to the Play Store using the same Keystore which we used to generate the Certificate and the Private Key for Defold’s sign-in process.
You must have somehow not successfully converted your key+cert into a keystore or you have uploaded the app to Google Play using another key+cert than the one you are trying to use now.