We've implemented a fix for the change made by Facebook, and syncing has been re-enabled for affected accounts.
Posted May 13, 2020 - 14:17 UTC
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Due to unannounced changes that Facebook have made to their API, we've had to temporarily disable syncing for Facebook accounts and Pages.
We're currently working on a fix, and are aiming to release it within the next few days. We'll provide updates here when the fix is scheduled to be released.