restTemplate.postForObject org.springframework.web.client.HttpClientErrorException: 404 Not Found - spring

Question

#RequestMapping(method = RequestMethod.POST, produces = {
MediaType.APPLICATION_JSON_VALUE })
public #ResponseBody String provisionUser(#RequestBody(required = true) String body) {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.add("key", "<key>");
HttpEntity<String> request = new HttpEntity<String>(body, headers);
String APIendpoint = "https://apiendpont.com/provision";
String obj = restTemplate.postForObject(APIendpoint, request, String.class);
return obj;
}
the restTemplate.postForObject() line in the above method is returning
org.springframework.web.client.HttpClientErrorException: 404 Not Found
I have tested the uri, and the header information in a REST client and receive a response - so I know that is the correct url.
I ran this in debug mode and the exception is thrown in RestTemplate.doExecute
protected <T> T doExecute(URI url, HttpMethod method, RequestCallback requestCallback,
ResponseExtractor<T> responseExtractor) throws RestClientException {
Assert.notNull(url, "'url' must not be null");
Assert.notNull(method, "'method' must not be null");
ClientHttpResponse response = null;
try {
ClientHttpRequest request = createRequest(url, method);
if (requestCallback != null) {
requestCallback.doWithRequest(request);
}
response = request.execute();
if (!getErrorHandler().hasError(response)) {
logResponseStatus(method, url, response);
}
else {
handleResponseError(method, url, response);
}
if (responseExtractor != null) {
return responseExtractor.extractData(response);
}
else {
return null;
}
}
catch (IOException ex) {
throw new ResourceAccessException("I/O error on " + method.name() +
" request for \"" + url + "\":" + ex.getMessage(), ex);
}
finally {
if (response != null) {
response.close();
}
}
}
Any ideas on what's going on? Thanks.