“You should be very careful about sharing your number and card to protect against misuse of your number. Giving your number is voluntary even when you are asked for the number directly. If requested, you should ask:

Why your number is needed;
How your number will be used;
What happens if you refuse; and
What law requires you to give your number.
The answers to these questions can help you decide if you want to give your Social Security number. The decision is yours”

Good luck. If it is for tracking purposes they should be able to use a random number instead.