Backport broken with saml token requirements

Error: {"message":"Resource protected by organization SAML enforcement. You must grant your personal token access to this organization.","documentation_url":"https://help.github.com/articles/authenticating-to-a-github-organization-with-saml-single-sign-on/"}

Start by tracing the backport entry point and the GitHub API call that produces this SAML enforcement error. Read the linked GitHub authentication documentation, then identify how token access is supplied and verify that backporting works for an organization requiring SAML authorization.

Written by the indexing model from the issue text.