Your Android App Bundle is signed with the wrong key. Ensure that your app bundle is signed with the correct signing key and try again

The error suggests that you have uploaded an APK or an App Bundle previously. All the artifacts you upload to the Play Console should all be signed with the same keystore. So the error means that you signed the App Bundle with a key that is different than the ones you have uploaded previously. You have to either find that keystore you used before or reset the key by contacting Play Console support team.

I tried using the multiple answers here & in this question, but somehow I was getting this error because I had some issues with my android/app/build.gradle and android/gradle.properties files.

Two things you should check (in addition to the other solutions here) are:

1. In android/gradle.properties and android/app/build.gradle, make sure your keystore variables match exactly.
   • In android/gradle.properties, you probably have something like this:

     MYAPP_RELEASE_STORE_FILE=<>
     MYAPP_RELEASE_KEY_ALIAS=<>
     MYAPP_RELEASE_STORE_PASSWORD=<>
     MYAPP_RELEASE_KEY_PASSWORD=<>
     

   • Make sure these variable names exactly match those in android/app/build.gradle:

     android {
         ...
         signingConfigs {
             release {
                 if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
                     storeFile file(MYAPP_RELEASE_STORE_FILE)
                     storePassword MYAPP_RELEASE_STORE_PASSWORD
                     keyAlias MYAPP_RELEASE_KEY_ALIAS
                     keyPassword MYAPP_RELEASE_KEY_PASSWORD
                 }
             }
         }
     }
     

2. In android/app/build.gradle, make sure you set signingConfig to signingConfigs.release in your release buildTypes:

   android {
       ...
       buildTypes {
           debug ...
           release {
               signingConfig signingConfigs.release
           }
       }
   }
   

I was banging my head on the table over this for about two hours. When I finally gave up and was filling out my "reset key" request, I realized that I was currently attempting to upload it to the wrong project the whole time.

So, step one: confirm that you're attempting to upload to the correct project.