All affected accounts have been successfully reimported and are up-to-date.
Posted Feb 22, 2017 - 23:11 PST
We've implemented a workaround and are currently reimporting all affected accounts.
Posted Feb 22, 2017 - 17:20 PST
We have identified a breaking change in the Facebook API that is preventing many Facebook accounts from successfully importing account and conversion tracking data. We have notified the Facebook team of this issue and are working with them on a resolution.