Then the UEFI IS password protected. That is the issue. See 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."
I'm sorry, but there isn't anything I can do to help. Please don't shoot the messenger.
I am not aware of a UEFI password. When I use the volume-up and power switch, i am presented with the option to enter a password. not having one, i simply click enter. I get UEFI screen only 3 lines are active, Advanced Device Security, can get in but only see and not alter anything.
Device Information, and Exit Setup.