Have you read the instructions at https://www.jenkins.io/doc/developer/publishing/releasing-manually/ which include making sure your plugin uses a reasonably up-to-date parent POM? I created https://github.com/jenkinsci/aws-codepipeline-plugin/pull/4 to try to help with that. That document has two other pieces of troubleshooting advice for 403 errors. If you still have problems after going through all of that then you can create an issue at https://github.com/jenkins-infra/helpdesk for an Artifactory administrator to check your permissions.
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