No, Pinterest does not notify the other person when you unblock them.
Throughout this entire process, the other user receives from the Pinterest app or website. does pinterest notify when you unblock someone
Unblocking on Pinterest is a discreet action. Unless the other person is actively monitoring their follower count or tries to visit your profile while they are still blocked, they will likely never know. You can manage your digital space with peace of mind, knowing your privacy settings remain your business. No, Pinterest does not notify the other person