Signing key mismatch (App Bundle uploaded was signed with a different key than the one expected by Google Play)

I tried updating my published app on Google play store and i received this message below:
"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."

How do i access the correct signing key so that the exported .AAB will match the same key used in publishing the mobile on Google play store.