Did you try raising the volume directly on the headphones? If it's a WH-XM1000, you can do that by sliding the finger up on the right earphone. For some reason

Did you try raising the volume directly on the headphones? If it's a WH-XM1000, you can do that by sliding the finger up on the right earphone. For some reason mine's volume works as expected on an iphone (phone and headphone control the same volume) but on a pc (windows / mac / linux) the controls work separately...