Empty response for /get_current_account

Hi,

some years ago I used the dropbox Api v1 and now I try to switch to v2.

I managed to get the authorization done but now I'm struggeling with the /get_current_account endpoint.

my php looks like that:

public static function dropboxAuthorize($token) {		
	$curl = curl_init();
	curl_setopt($curl, CURLOPT_VERBOSE, 1);
	curl_setopt_array($curl, array(
	  CURLOPT_URL => "https://api.dropbox.com/2/users/get_current_account",
	  CURLOPT_RETURNTRANSFER => true,
	  CURLOPT_ENCODING => "",
	  CURLOPT_NOBODY => true,
	  CURLOPT_MAXREDIRS => 10,
	  CURLOPT_TIMEOUT => 50,
	  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
	  CURLOPT_CUSTOMREQUEST => "POST",
	  CURLOPT_HTTPHEADER => array(
		"authorization: Bearer " . $token,
		"cache-control: no-cache",
		"content-type: application/json"
	  ),
	));

	$response = curl_exec($curl);
}

The response is empty! Not false or anything else. I get no erros and don't know what's wrong.

If I send the request via Postman I get the correct response.

This is my var_dump of the response and curl_getinfo:

string(0) ""
Array
(
    [url] => https://api.dropbox.com/2/users/get_current_account
    [content_type] => text/plain; charset=utf-8
    [http_code] => 400
    [header_size] => 394
    [request_size] => 259
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.273269
    [namelookup_time] => 3.3E-5
    [connect_time] => 0.004135
    [pretransfer_time] => 0.017209
    [size_upload] => 0
    [size_download] => 0
    [speed_download] => 0
    [speed_upload] => 0
    [download_content_length] => -1
    [upload_content_length] => 0
    [starttransfer_time] => 0.27322
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => 162.125.66.7
    [certinfo] => Array
        (
        )

    [primary_port] => 443
    [local_ip] => 46.38.241.53
    [local_port] => 50110
)

Can someone help me pls?