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 firebase code example

Example: 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

This option can be updated only at time of app creation and first realease 
1. Firstly you need to change the "App signing preference"
2. Select "Export and upload key from java keystore"
3. Follow steps mentioned there and get keystore.zip
4. after uploading this zip and try again. Now key will be accepted!

Some links helped:
https://stackoverflow.com/questions/54314838/googleplay-wrong-signing-key-for-app-bundle
https://confluence.atlassian.com/doc/setting-the-java_home-variable-in-windows-8895.html
https://medium.com/@the_manifest/how-to-publish-an-app-on-google-play-a-step-by-step-guide-80f9f533e370

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Misc Example