You will see a list of blocked profiles and Pages. Tap Unblock next to the specific Page and confirm. Understanding Different Types of "Blocks"
Scroll down and tap Settings & Privacy , then tap Settings . unblock a facebook page
Unblock a Facebook profile, Page, or nickname | Facebook Help Center You will see a list of blocked profiles and Pages
Click your profile picture in the top right corner. unblock a facebook page
Tap the Menu icon (three horizontal lines or your profile picture).