Cannot adjust the volume of the earbud headphones

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The procedure to adjust the volume of the headphones varies depending on the version of the Sony | Headphones Connect app and the headphones software.

Assign the playback volume adjustment function to the touch sensor of the headphones

The procedure below shows how to change the assigning function for the left unit from Ambient Sound Control to Volume Control.
The example images below are of the Sony | Headphones Connect app for Android smartphones and the WF-1000XM3 headphones. If you use an iPhone, the screen layouts will differ slightly. 

1. Start the Sony | Headphones Connect app.

2. Tap the  (Settings) icon at the bottom of the Change the touch sensor function.

   

3. On the Left unit settings, tap Ambient Sound Control, and set the Function to Volume Control.

   

4. Check that the Function has changed to Volume Control, and tap Done.

   

5. Check that the Left unit of the Change the touch sensor function is set to Volume Control. You can now use the left unit touch sensor to adjust the headphone's volume.

   

Adjust the volume on the playback device connected via Bluetooth

When making a call, you can adjust the volume as necessary on the playback device connected via Bluetooth.

Adjust the volume on the Sony | Headphones Connect app

Install the Sony | Headphones Connect smartphone app, then change the volume using the app.

On a device that can be linked with the headphones, you will have the ability to change the volume level of the headphones using that device. You will not be able to change the headphones volume on a device that can't be linked with the headphones.