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.
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.
Once the permissions are refreshed, the albums will automatically get back on your website in about 10 minutes.