[ceph-users] Difficulty creating a topic for bucket notifications

Hi, I am trying to create a topic so that I can use it to listen for object creation notifications on a bucket. If I make my API call without supplying AWS authorization headers, the topic creation succeeds, and it can be seen by using a ListTopics call. However, in order to attach a topic to a bucket, the topic and bucket must have the same owner. So I tried creating a topic using AWS auth. The credential header I tried was the same as what I use for get/put items to a bucket: Credential=<access key id>/20200512/us-east-1/s3/aws4_request However in this case rather than succeeding I get a NotImplemented error. If I tried changing the service in the credential to something other than s3, like "Credential=<access key id>/20200512/us-east-1/s3/aws4_request" I instead get a SignatureDoesNotMatch error. What is the right way to authenticate a CreateTopic request? Thanks, Alexis