On the vote by mail application you will need to enter a number for: A valid ND driver's license, ND non-driver ID, North Dakota tribal ID. This ID must show your name, current address (not a PO Box), and date of birth is required. If your ID does not show all of that, it can be supplemented by specified documents: https://www.voteriders.org/states/north-dakota/. If you are military serving away from ND, you may include a current military ID or passport.
Your signature needs to match the signature on file with the state (e.g. if you use a middle initial or not)