Hello, if you have the incoming message and need to turn on/off the ringtones, you can go to DingTalk mobile app [Me] - [Settings] - [New Message Notification] to set;
At the same time, the phone's own system settings also need to enable message notification permissions.
a. iPhone: [Settings] - [General] - [Notiifications] - [DingTalk] - Turn on [Allow Notifications];
b. Android: (Please refer to the mobile phone model for details); https://tb.cn/X9zkZJx

Desktop Client: right upper coner [Profile Photo] - [Settings] - [Notice] - turn on/off [Message Tone].