If your Bluetooth volume controls no longer work after you install a Windows update, follow these steps.
Make sure you've installed the latest updates from Windows Update. (A solution for this issue was included in the October 24, 2018—KB4462933 (OS Build 17134.376) update.
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To check for updates, on Windows 11:  Start > Settings > Windows Update > Check for updates.
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To check for updates, on Windows 10:  Start > Settings > Update & security > Windows Update > Check for updates.
If installing updates do not resolve your issue, you may need to manually disable the Absolute Volume feature by making a change in the registry. (Warning: Serious problems might occur if you modify the registry incorrectly.  For added protection, back up the registry before attempting to modify it.)
To disable the Absolute Volume feature, go to Start and type cmd. Right-click Command Prompt in the Search results and select Run as administrator.
In the Command Prompt window, type the following command:
reg add HKLM\SYSTEM\ControlSet001\Control\Bluetooth\Audio\AVRCP\CT /v DisableAbsoluteVolume /t REG_DWORD /d 1 /f
You may need to restart Windows for the registry change to take effect.
Note:Â To re-enable the Absolute Volume feature, type the following command in the Command Prompt window:
reg add HKLM\SYSTEM\ControlSet001\Control\Bluetooth\Audio\AVRCP\CT /v DisableAbsoluteVolume /t REG_DWORD /d 0 /f
