You cannot block a member who is an admin or owner of a LinkedIn Group you belong to. To block them, you must first leave that group.

: If you are trying to block multiple people rapidly and the platform stops you, your account might be under a temporary restriction for automated activity.

LinkedIn engineers decided that allowing instant re-blocking would create a "harassment loophole."

If you block, unblock, and re-block someone within minutes, and that person claims harassment, LinkedIn’s audit log looks chaotic. The cooling period creates a clear, defensible timeline: “You chose to unblock them on Tuesday. You had full access until Thursday. Any interaction during that window was consensual from a platform perspective.”

The question has a frustratingly simple answer: LinkedIn’s backend needs 48–72 hours to resolve the previous unblock before allowing a new block. This is not a glitch or a punishment—it’s a deliberate technical limitation to protect database integrity and prevent harassment loops.

To understand why you can’t block them again, you have to understand how LinkedIn’s backend views a "Block." Unlike Twitter or Instagram, where blocking is a simple visibility toggle, LinkedIn blocks are data-intensive. When you block someone: