I get an error “Failed to provide a valid list of administrators” on some (hail, non-determinism!) of my Like buttons on two different websites. Both have a valid fb:app_id meta tag and show no error in the Open Graph object debugger.
One of my non-likable objects: http://twizy2night.com/very-bad-cannes-mission-impossible.php
I’m aware of the amount of questions concerning this error, but none of the answers fix my problem.
It sounds like a bug on Facebook side (or a cache thing), but I could be missing something, and I can’t find a reported issue on Facebook Bug Tracker.
Try also adding the
fb:adminstag to your pages:<meta property="fb:admins" content="xxx,yyy,zzz" />