Feature [Bulk Assign] is not available, one of the Directory Integration features should be enabled

I am trying to create user using SCIM API

https://platform.devtest.ringcentral.com/scim/v2/Users

But I am getting the below error whenever I trying to call the API. I referred this article https://community.ringcentral.com/questions/9000/feature-bulk-assign-is-not-available.html . But I cannot see the option "Tools" in admin portal. Can somebody help?

{
  ""schemas"" : [ ""urn:ietf:params:scim:api:messages:2.0:Error"" ],
  ""status"" : ""403"",
  ""detail"" : ""Feature [Bulk Assign] is not available, one of the Directory Integration features should be enabled""
}