As with the ringtones, you can set the notification tone for incoming messages or notices on the Huawei smartphone itself. This is set as the default and used for every notification, unless an app-specific notification tone is selected.

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  Sounds & vibration
Step 3:  Tap on  Notification sound
Step 4:  Choose a  ringtone
  1. Open the settings
  2. Tap on Sounds & vibration
  3. Tap on Notification sound
  4. Choose a ringtone

Huawei Instructions