You will need to sign in to your account first and foremost to access your blocked list.
Next, go to Shortcuts in Privacy
Click on View all Blocked users.
Locate the person you wish to unblock on FB and tap on unblock by the side – next to the person’s name.
Steps On How to Unblock a Facebook User on Android Device
You’ll need to tap on More Button >> Account Settings >> Blocking >> Tap on Blocked User.
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