https://support.microsoft.com/en-us/help/4023531/surface-how-to-use-surface-uefi "UEFI passwords are used primarily by enterprises and IT professionals to limit the types of changes that employees can make to their devices. If you are part of an enterprise, contact your IT administrator if you have any questions or issues with your UEFI password. If you are not part of an enterprise and you choose to create a UEFI password, make sure to document your password in a safe place. You cannot reset your UEFI password, and Microsoft cannot retrieve it."
Also see Forgot UEFI password for Surface - Microsoft Support
Is WiFi also disabled? If not, can you get to Device Manager and check the status of Bluetooth there? Also check Settings, Bluetooth and Devices and see if it is off.