If you send a message from your Huawei device, you will hear a little audio signal by default to signal the message is sent. You can (de-)activate this if wished.

Android 10 (EMUI 10.0)
Step 1:  Open  Messages
Step 2:  Open the  menu
Step 3:  Open the  settings
Step 4:  Activate or deactivate  Hear outgoing message sounds
  1. Open Messages
  2. Open the menu
  3. Open the settings
  4. Activate or deactivate Hear outgoing message sounds

Huawei Instructions
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