You are currently in a vulnerable state: you unblocked someone, you cannot re-block them, but they may now be able to view your profile again. If you need immediate protection, follow these steps:
The 48-Hour Rule: Why You Can’t Re-Block Someone on LinkedIn You are currently in a vulnerable state: you
They simply regain the ability to view your public profile (if your privacy settings allow it) and send you a connection request. you cannot re-block them