The problem I am facing is that whenever I upload the aab file on play console it says
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:
When you want to publish an update to a former app of yours, that update needs to have the same key as the 1st version of the app.
To do that, you need to export your original android key form the first version, and import it to update.