Getting http_code 404 while trying to create API User

I have this header " [request_header] => POST /apiuser HTTP/1.1 Host: Content-Type: application/json X-Reference-Id: c85425f5-5cg4-4i60-9924-8ba4723ad57 Ocp-Apim-Subscription-Key: 36c1c740582041729dfxxxxxxxxxxxxx Accept: application/json Content-length: 42 " and content {"providerCallbackHost": ""} But Getting the result { "statusCode": 404, "message": "Resource not found" } I'm posting to this URL :

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