Invalid auth/bad request (got a 401, expected HTTP/1.1 20X or a redirect)

API not working on PROD environment (SSL enabled), getting the following error when trying to access the endpoints via oauth

OAuthException Object
(
    [message:protected] => Invalid auth/bad request (got a 401, expected HTTP/1.1 20X or a redirect)
    [string:Exception:private] =>
    [code:protected] => 401
    [file:protected] => <DOCROOT_PATH>/sites/all/modules/oauth_client/oauth_client.module
    [line:protected] => 83
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => <DOCROOT_PATH>/sites/all/modules/oauth_client/oauth_client.module
                    [line] => 83
                    [function] => fetch
                    [class] => OAuth
                    [type] => ->
                    [args] => Array
                        (
                            [0] => <PRODUCTION_SERVER>//profile/node.json
                            [1] => Array
                                (
                                )

                            [2] => POST
                        )

                )

            [1] => Array
                (
                    [function] => oauth_client_page_callback
                    [args] => Array
                        (
                        )

                )

            [2] => Array
                (
                    [file] => <DOCROOT_PATH>/includes/menu.inc
                    [line] => 527
                    [function] => call_user_func_array
                    [args] => Array
                        (
                            [0] => oauth_client_page_callback
                            [1] => Array
                                (
                                )

                        )

                )

            [3] => Array
                (
                    [file] => <DOCROOT_PATH>/index.php
                    [line] => 21
                    [function] => menu_execute_active_handler
                    [args] => Array
                        (
                        )

                )

        )

    [previous:Exception:private] =>
    [lastResponse] => ["Token not found"]
    [debugInfo] => Array
        (
            [sbs] => POST&https%3A%2F%2<DOMAIN>%2F%2Fprofile%2Fnode.json&oauth_consumer_key%<KEY>%26oauth_nonce%<PARAM>.89849805%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1455167746%26oauth_token%<TOKEN>%26oauth_version%3D1.0
            [headers_recv] => HTTP/1.1 401 Unauthorized : Token not found
Cache-Control: no-cache, must-revalidate, post-check=0, pre-check=0
Content-Type: application/json
Date: Thu, 11 Feb 2016 05:15:47 GMT
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Server: nginx
Vary: Accept-Encoding
WWW-Authenticate: OAuth realm="<DOMAIN>"
X-AH-Environment: prod
X-Content-Type-Options: nosniff
X-Drupal-Cache: MISS
X-Request-ID: <REQUEST_ID>
Content-Length: 19
Connection: Close
            [body_recv] => ["Token not found"]
        )

    [xdebug_message] =>
OAuthException: Invalid auth/bad request (got a 401, expected HTTP/1.1 20X or a redirect) in <DOCROOT_PATH>/sites/all/modules/oauth_client/oauth_client.module on line 83

)