Description of problem: While creating a user via the RGW Admin Ops API. It seems like this operation is not implemented when using AWS Signature Version 4 for signing requests. The operation fails with the Error : ERROR: AWS4 completion for this operation NOT IMPLEMENTED This is a request to implement user creation when AWS Signature Version 4 is used for signing requests. Version-Release number of selected component (if applicable): 14.2.11-147.el8cp