Thank you for asking this question.

The most common reason for this would be because of missing permissions in your EmbedSocial account. This can be resolved with one click.
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Just go to the "Social Accounts" section in the left side menu and click the "Refresh" button:

Please make sure that you are logged in another tab with the same Facebook account, this process can be successful.
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Once the permissions are refreshed, the albums will automatically get back on your website in about 10 minutes.