Playlist Service and List action - iOS Swift

I have been trying from last 7+ hours to get the list of playlist.

I am working on an iOS project and using following:-

https://www.kaltura.com/api_v3/?service=playlist&action=list&format=1&ks=djJ8MTc0MjQwMXx1XumreiJq03TgiDa1ZFVHq7mlcwfi3grRJ-B4MqTzqoI9QgmCLPCbYxMVWvRWu53OfEHlLZuvSkt02ooOBO8z

And I have been getting this in my console:-
{
"objects":[],
"totalCount":0,
"objectType":"KalturaPlaylistListResponse"
}

I tried testing it on http://www.kaltura.com/api_v3/testme/ and I get same result.

But when I test it on https://developer.kaltura.com/console/#/playlist.list .... I get expected result, the list of playlists

Please suggest what am I doing wrong?