Ref: Facebook Link Ownership Guide
On November 7, 2017, Facebook released a new API version, 2.11. It includes an additional restriction to publish posts only from the authors who own a Page and an associated domain.
There are two alternatives to verify the ownership of a domain and an associated page:
Any of these method can be used to verify the ownership. If you opt to implement the AutoTweet Facebook OpenGraph Tags plugin, the Page ID can be found here:
To access your Facebook's Page ID:
After you identify the ownership of your domain, you must re-authorize the Facebook channel.
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