You can unblock users through the mobile app or a desktop browser:
If you prefer using Facebook’s website to manage Messenger blocks: fb messenger unblock
There is a specific phenomenon regarding and the unblock. If you have been conversing with someone who suddenly tells you they blocked you by accident or need you to unblock them, proceed with extreme caution. You can unblock users through the mobile app
The phrase "fb messenger unblock" is one of the most searched terms in the context of social media relationships, yet it is often misunderstood as a mere technical toggle. fb messenger unblock