On Android 8 the media volume controls adjust the volume played back by the headset.
After applying the upgrade to Android 9 the controls seemed sporadic: sometimes the handset volume controls would adjust the headphones, sometimes it would not.
If you go into the Settings > Connections > Bluetooth > ... > Advanced the "Media Volume Sync" setting was greyed out and it said underneath "Not supported by the connected Bluetooth device".
This post seemed to fix it. By renaming the headphones to ABS-DO-ENABLE and disconnecting and reconnecting the handset volume then controlled the bluetooth headphone volume.
Once you've got it working, renaming it back seems to continue to work.
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