API - HTTP/1.1 404 Not Found

Hi,
I have installed 7.10.10 SuiteCRM.
I’m trying to connect to API,
but I still receive (from POST call and also from browser)
HTTP/1.1 404 Not Found
when I call my https://MYCRMDOMAIN/api/oauth/access_token

I’ve read all the documentation and a lot of forum thread,
my htaccess seems ok, I’ve tried also to rebuild it.
I’ve meet all requirements specified in api documentation.

Also using php with example provided in documentation:

$ch = curl_init();
$header = array(
    'Content-type: application/vnd.api+json',
    'Accept: application/vnd.api+json',`
 );
$postStr = json_encode(array(
    'grant_type' => 'password',
    'client_id' => '3D7f3fda97-d8e2-b9ad-eb89-5a2fe9b07650',
    'client_secret' => 'client_secret',
    'username' => 'admin',
    'password' => 'admin',
    'scope' => 'standard:create standard:read standard:update standard:delete standard:delete standard:relationship:create standard:relationship:read standard:relationship:update standard:relationship:delete'
));
$url = 'https://path-to-instance/api/oauth/access_token';
curl_setopt($ch, CURLOPT_URL, url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_POSTFIELDS, $postStr);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
$output = curl_exec($ch);

Returns 404 not found

Any suggestion of the cause?

Hi,
I’ve made some test, it seems that the URL is not responding correctly.
If you open a test SuiteCrm API URL, for example:
https://demo.suiteondemand.com/api/oauth/access_token
you receive the JSON response

I’ve installed on another network also the Univention SuiteCRM Appliance (so a new installation),
and also with this new installation, if I open the URL https://mycrmdomain/api/oauth/access_token
I receive the 404 error instead of the JSON response…