How to send announcement in yammer through api i tried below but its not working

[Vamshi Amaravadi]

How to send announcement in yammer through api i tried below but its not working.Giving some security state:0 error.Even though i selected log in before posting.

url: "messages.json"
,headers: {'Authorization': 'Bearer GGFFBBB-88966333' }
, method: "POST"
, data: {
"body": "Msg",
"log_data[publisher_type]": "yam.ui.publisher.global.AnnouncementPublisher",
"log_data[publisher_source]": "group",
"log_data[number_of_recipients]": "1",
"invited_user_ids": "",
"skip_body_notifications": "true",
"group_id":"44556699",
"is_rich_text": "true",
"message_type": "announcement",
"title": "Title"
}
, success: function (msg) { alert("Post was Successful!"); }
, error: function (msg) { alert("Error"+JSON.stringify(msg)); }

[#2]

Couple of things to check:

1. The account you are posting with has the ability to post Announcements. (I know perhaps a daft question)
2. The body of the message is formatted using HTML
3. Can you post a message to the group?

The POST will look something like (for speed I've used the Flow so its added in a couple of extras):

[
  {
    "id": 1120667167,
    "sender_id": 1512434534,
    "replied_to_id": null,
    "created_at": "2018/07/09 14:41:44 +0000",
    "network_id": 41253,
    "message_type": "announcement",
    "sender_type": "user",
    "url": "https://www.yammer.com/api/v1/messages/1120667167",
    "web_url": "https://www.yammer.com/tenantname/messages/1120667167",
    "group_id": 4191007,
    "title": "Testing (ignore)",
    "body": {
      "parsed": "Testing posting from Flow with some html\n",
      "plain": "Testing posting from Flow with some html",
      "rich": "Testing posting from Flow <p>with some html</p>"
    },
    "thread_id": 1120667167,
    "client_type": "Microsoft PowerApps and Flow (Europe)",
    "client_url": "http://www.powerapps.com",
    "system_message": false,
    "direct_message": false,
    "chat_client_sequence": null,
    "language": null,
    "notified_user_ids": [],
    "privacy": "public",
    "attachments": [],
    "liked_by": {
      "count": 0,
      "names": []
    },
    "content_excerpt": "Testing posting from Flow with some html",
    "group_created_id": 4191007
  }
]