Can't access Yahoo mail from iPad/iPhone Mail app

I changed my yahoo password due to recent security breach. Since I can't change my yahoo password on my Mail app running iOS 10.2, I deleted my yahoo account and added back to changed the password. Now, I am getting "Can Not Get Mail, The connection to the server failed" message. Seeing same problem on both iPad and iPhone. But I can access my yahoo mail thru safari web browser from both iPad and iPhone. Any idea?