Unable to change disk password

Hello, I got the x230 with qubes preinstalled. I tried to change the disk password with “sudo cryptsetup luksChangeKey /dev/sda2”. I got "Device /dev/sda2 doesn’t exist or access denied.
If “sudo lsblk” I dont see a sda2 device. Any tips? Don’t be rude, i give my best to improve my knowledge as much as I can! Greetings

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