Yeah, you’re going to need to register your VHF radio in order to make it operable with other radio devices, here are some sites where you can get this done.
USCG info:
https://www.navcen.uscg.gov/?pageName=mtmmsi
to register:
https://www.boatus.com/mmsi
https://www.seatow.com/tools-and-education/mmsi