Facebook FB.api Notication stopped working

FB.api(/userid/notifications,'post',{access_token:{appid}|{appsecret},template:"our text"},function (response){console.log(response);});

The above is how we are using to send notification to user registered in our app. The response is success true but still the user does not get the notification. I created a demo app and tried the above code which returned success true and it did send notification, what could be the issue. What am I doing wrong? The code was working when I checked a day or two back and nothing was changed. Please help me with this.