                 $0.title ?= title
                 $0.subtitle ?= subtitle
                 $0.badge ?= badge
-                $0.sound ?= sound
+                $0.sound = sound
                 if let userInfo = userInfo { $0.userInfo = userInfo }
                 if let attachments = attachments, !attachments.isEmpty { $0.attachments = attachments }
             }

                $0.title ?= title
                $0.subtitle ?= subtitle
                $0.badge ?= badge
                $0.sound ?= sound
                if let userInfo = userInfo { $0.userInfo = userInfo }
                if let attachments = attachments, !attachments.isEmpty { $0.attachments = attachments }
            }

                $0.title ?= title
                $0.subtitle ?= subtitle
                $0.badge ?= badge
                $0.sound = sound
                if let userInfo = userInfo { $0.userInfo = userInfo }
                if let attachments = attachments, !attachments.isEmpty { $0.attachments = attachments }
            }
