clientless sftp

i have configured a clientless sftp policy that contains the bookmark and the bookmark contains the private and public key along with server information. I created a user on our portal and allowed it to use this policy. I did on the side another rdp policy to make sure the user is fine and it is working. But when i connect ot the sftp it gives me forbidden, what am doing wrong? same settings am connecting it using Winscp and am fine.