If you use a Bluetooth-headset or -speaker, you first need to connect these devices. For this, you need to turn on Bluetooth first.

Note: Bluetooth can be turned on or off on your Huawei device over the quick start bar too. If you do not use Bluetooth, we recommend turning it off to save battery.

Android 10 | EMUI 10.0
Bluetooth -  Open the  settings
Bluetooth -  Tap on  Bluetooth
Bluetooth -  Activate or deactivate  Bluetooth
  1. Open the settings
  2. Tap on Bluetooth
  3. Activate or deactivate Bluetooth

Huawei Instructions