Comment 18 for bug 1298135

While that is true that Swift could be made aware of service token, one should also consider that implementation of the Swift API for example in Ceph RadosGW would probably not have such a mechanism yet or be easily implemented there.

Other than that, configuring Cinder service_auth, set sending service token config opt to true and verify that Cinder indeed sends service token (for cinder-backup service, by default) and then checking in native OpenStack Swift would be a good first step.