That is correct.
There is no number assigned by the instructors when they do the class and issue the card. When it gets entered into the permanent record system, in Harrisburg, though it does get a number. If you contact the Hunter Education Division in Harrisburg they can provide the number for you if you are dealing with a state that will not issue the license without the number. Most states are fine though with seeing the card or simply knowing it was issued in one of the several states that don’t have student numbers on the cards when issued.
Good luck, but if you need it just call the Harrisburg Headquarters and they can provide the number.
Dick Bodenhorn