Hey Chris,
I am sorry that delay of this reply,
I've tried to access in your Joomla backend, but i hitting this forbidden error :
Forbidden
You don't have permission to access /administrator/ on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
By the way, you can follow my below instruction how to renew/re-authentication again :
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#1. Remove the Facebook apps from your Facebook account > setting > apps > search "which facebook apps you configured in Easyblog" > Click remove apps link
#2. GOTO your backend > Easyblog > Autoposting > Facebook > Click "Revoke access" > then wait for refresh the page > Click "Sign in via Facebook" > Click next until everything okay.