I got it. You've never worked in a secured space. Truly secure.
You never, ever, badge someone else into a space on your badge.
You call, and you wait, to be allowed in.
Letting someone else in on your badge gets you fired.
It doesn't matter if their badge used to work, or if they work in that space. Let HR/security manager/whoever handles access do their job.
If you let them in, you get fired. You have signed paperwork to that effect. That's how security is enforced. If a sailor allowed a fellow sailor into a classified space, both sailors could be fired*.
*Navy equivalent: fined, reduced in rank, and/or kicked out of the Navy. Depends on the circumstances, but career over. No appeal. No discussion.