This started all of a sudden. Other APIs e.g. Campaign creation, Adset creation etc are working fine but I am not able to create ads via API.

Error-

{ "error": { "message": "Application does not have permission for this action", "type": "OAuthException", "code": 10, "error_subcode": 1815574, "is_transient": false, "error_user_title": "App Permission Missing", "error_user_msg": "App 729,690,972,144,381 does not have permission for this action", "fbtrace_id": "Av2JIOM0448H4j4046cSstT" } }