Hi! It was solved.
In google play, request the key change, from the option : app signatures --> contact the developer support team
they send you an email in 24 hours requesting to create the upload_certificate.pem file
You must answer the email attached to that file
Google loads it in playstore and in 48 hours you can use the new key to continue with the signing steps.
My mistake was to use keytool from an old versionof java.
So I would recommend before uploading the upload_certificated.pem file into the playstore, complete the process of creating the signed.apk file to ensure that a similar problem does not arise
Thanks a lot!