Facebook News Page Registration is only applicable to News Publishers. It is mandatory for enabling Facebook Messenger Subscription.
Here is a step by step process to submit Facebook page for News Page Registration.
How to apply
Step 1 :- Go to Business Manager -->> Business Settings -->> Registrations tab -->> News pages
Only an admin who has access to the page in Business Manager can get the page registered.
Step 2:-Select the page that needs to be registered.
Step 3:- Fill in all the required details here.
Add your website.
Verify your Domain: You will need a DNS verification or else you can upload an HTML verification file to your website.
Verify your Business: You will need to submit certain verification documents here.
Register Content Behind Paywalls (for Publishers who have paid content): You will have to give a demo username and password so as the Facebook team can review your paid content.
Step 4:- Once the above fields have been filled and completed, each block's border will turn green.As and when all the block's borders turn green, the 'Submit' button will get enabled.
Step 5:- Submit.
After the application for registration is submitted, Facebook's team will take their own sweet time in reviewing your page's content according to their content policy guidelines. You can read more about it here.
Usually, it takes around 1-3 weeks for the approval to come through.