Huawei
Set Notification Sound auf Huawei
The default notification sound on a Huawei phone is a system-wide setting managed by EMUI. It plays for every app notification unless that app has its own sound assigned in its individual notification settings.
To change it, open Open the settings ➔ Tap on Sounds & vibration ➔ Tap on Notification sound ➔ Choose a ringtone. Select any tone from the list and it becomes the new default for all apps that don't override it.
When this setting does not help
If one specific app keeps making a different sound, that app has its own notification tone configured in its app-level settings. Changing the system default here will not affect that app; you need to adjust the sound inside that app's own notification options instead.
Switching the default tone has no effect on ringtones for calls or on vibration patterns. Those are configured separately, even though they live in the same Sounds & vibration menu.