Facebook has implemented a fix, and all affected accounts have been successfully reimported.
Posted almost 2 years ago. Jan 19, 2017 - 06:32 PST
We have identified a breaking change in the Facebook API that is preventing many Facebook accounts from successfully importing account and creative data. We have notified the Facebook team of this issue and are working with them on a resolution.
Posted almost 2 years ago. Jan 11, 2017 - 20:41 PST