The other player will not receive a notification that you unblocked them. However, they will notice they can now see your profile or send you messages again.
It is important to understand the social mechanics of unblocking to avoid any awkwardness: how to unblock players on ps4
Unblocking someone does not automatically make them your friend again. If you were friends before the block, that connection was severed. You will need to send a new Friend Request if you want them back on your list. The other player will not receive a notification
If the player is not showing up in your friends list, or you want to see a full list of everyone you have ever blocked, use this method. If you were friends before the block, that
If you remember their PSN ID, you can search for them directly. If not, tap your icon and look for Privacy Settings .
There are two primary ways to do this: through the (easiest if you recently blocked them) and through the Privacy Settings (best if you cannot find the player).