Sometimes you block someone only on Messenger (to stop receiving messages) without blocking their entire profile.
and tap the "Unblock" button next to it. how to unblock someone from fb
Unblocking someone on Facebook is a simple process that can help you reconnect with someone you've previously blocked. Whether you've had a change of heart or want to give someone another chance, unblocking them can be done in a few easy steps. Remember that unblocking someone on Facebook allows them to interact with you again, so make sure you're comfortable with that before taking this step. Sometimes you block someone only on Messenger (to