The solution to the lack of notification sound for new messages on DingTalk is as follows

If there is no notification sound for messages on DingTalk, click "Me" in the lower right corner of DingTalk, then click "Settings" inside, and check whether the new message notification is turned on. If not, click the "Turn on" button, and generally there will be a notification sound. If there is no new message notification sound, click the phone settings, find notifications, and then click notification management to see if DingTalk is in the notification management. If it is, click on the notification sound inside.