Get Configuration API

In the documentation to get the configuration through, the API:

when i curl the command on the server:
https://severname:9200/_opendistro/_security/api/config
The following error is returned:
{“error”:“no handler found for uri [/_opendistro/_security/api/config] and method [GET]”}

The other APIs work, it’s just the api/config I am having issues with.