keybaord

I Have a question for owners of 'Microsoft Modern Keyboard with fingerprint ID' (EKZ-00001). Is this keyboard can work as USB keyboard. What I mean is: 1. Is it available when rebooting PC – for example in bios 2. Can I use it when Bluetooth is turned off or not available

I have just purchased the Microsoft Surface Keyboard which i'm really liking.. however.... There is one button that is extremely bugging me (screenshot attached) as it doesn't do anything. it looks like a message, so id imagine for new email or Teams etc but...nothing!! I'm using a surface pro...