Alexa Reminders API 401 response

So, I am using Amazon Alexa Reminders API as shown here. Here is my method for sending requests to API:

public static void sendReminder(String accessToken, String reminderText, long offsetInSec) {
    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost post = new HttpPost("https://api.amazonalexa.com/v1/alerts/reminders");
    post.addHeader("Authorization", "Bearer " + accessToken);
    post.addHeader("Content-Type", "application/json");
    TimeZone tz = TimeZone.getTimeZone("UTC");
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'");
    df.setTimeZone(tz);
    String nowAsISO = df.format(new Date());
    String jsonContent = "{ \"requestTime\" : \"" + nowAsISO + "\", \"trigger\": { \"type\" : \"SCHEDULED_RELATIVE\", \"offsetInSeconds\" : \"" + offsetInSec + "\" }, \"alertInfo\": { \"spokenInfo\": { \"content\": [{ \"locale\": \"en-US\", \"text\": \"" + reminderText + "\" }] } }, \"pushNotification\" : { \"status\" : \"ENABLED\" } }";
    HttpEntity entity = null;
    try {
        byte[] bytes = jsonContent.getBytes("UTF-8");
        entity = new ByteArrayEntity(bytes);
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    post.setEntity(entity);
    try {
        CloseableHttpResponse response = client.execute(post);
        System.out.println(response);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

And I execute it like this:

RemindersToolkit.sendReminder(session.getUser().getAccessToken(), "text", 1);

Skill also has permission for reminders:

But when the method is executed, I get the following response:

HttpResponseProxy{HTTP/1.1 401 Unauthorized [Content-Type: application/json, Connection: keep-alive, Server: Server, Date: Tue, 22 Jan 2019 00:21:21 GMT, Vary: Accept-Encoding,User-Agent, x-amz-rid: 8YMCM10GKVGTT71JQH3N, X-Cache: Error from cloudfront, Via: 1.1 05a90e634e0872685ad69ee9a4e0eba5.cloudfront.net (CloudFront), X-Amz-Cf-Id: J5CtMnkUTv1hd6p-7-tob7mCb-4DM7y_LxhEiMLt5x3qEqmzhwbx_Q==] org.apache.http.client.entity.DecompressingEntity@6df97b55}

According to Amazon on this page, 401 UNAUTHORIZED means Token is valid but does not have appropriate permissions.

Maybe some of you guys had the same problem or could help me figure out how to solve mine? Thanks

Solution

The issue was that I was using the old Alexa SDK. I had to download current version of the SDK and there is a different key (not accessToken I've used), which can be obtained directly from the Intent object and can then be used to send requests