Unable to update username using JIRA REST API in Cloud

Summary
Unable to update username using JIRA REST API in Cloud

Steps to reproduce

• Send https:// {instance_URL}

  /rest/api/2/user?username=

  {username that you want to modify}
• JSON: { "name": "test" }
• It will produce the error like below:

  {
      "errorMessages": [
          "This user can not be renamed because that operation is unsupported by the underlying user directory or JIRA is acting as a Crowd Server."
      ],
      "errors": {}
  }
  

Expected Behaviour
Based on this documentation https://docs.atlassian.com/jira/REST/ondemand/#d2e5367 , we should be able to modify the username in Cloud.

Affects Versions

• 6.5-OD-08-001