Alarm goes off when I use valet key and doesnt shut off

Find original keys or purchase another key from Honda dealer or professional locksmith .. They'll tell you when you need to do to get it done.

IF-IF, this car is equipped with ONLY Honda OEM anti-theft system, then using even just the valet key in the door, should disarm a 'normal system '. I suspect it either has an 'add-on' alarm, or you have a problem within the factory system. Inspection would be required to determine the needed action(a) if add-on.