Google Play: Your Android App Bundle is signed with the wrong key

Question

Since I had to upgrade to Flutter 2 I decided to start a new project with null safety and move my lib folder to it. I also moved my keystore (this was always store in my repo as well so I never lost it).

After many changes (more than 500 thanks Flutter team) I pushed a new appbundle to Google Play and got this message:

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. Your app bundle is expected to be signed with the certificate with fingerprint: SHA1: A but the certificate used to sign the app bundle that you uploaded has fingerprint: SHA1: B

I always had SHA1 A for everything. So I went to my old Flutter 1 branch, downgraded Flutter version and ran this:

keytool -keystore assets/.keystore -list -v

Again, SHA1 A was shown. I even compiled from this again but... not I didn't get any error message.

Why is this?

I also tried in new branch copying old key (which again, it's the same) and got also the error

Solution

I did not copy ios or android folder and the last one I was missing the keystore also inside of it and do some changes for the build.gradle. I could share it but I guess everyone could have different config here. Just keep on mind that this could point as well to the keystore like:

release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile file(keystoreProperties['storeFile'])
            storePassword keystoreProperties['storePassword']
        }