Facebook API has been changed on April 4th, 2018 without any warning, and now it does not allow bringing posts from public groups. You can find more information about this here.
In case you use a Facebook feed created with a group, unfortunately, you will experience problems.
Additionally, according to Facebook’s privacy policy, unfortunately, it is not possible to display posts from a personal profile. Facebook API provides data about public Facebook pages only.
If you have a Facebook feed of a profile which represents your business or organization, it is recommended to switch the profile to a public page. Furthermore, using Facebook pages over profiles brings many advantages and benefits.
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