The street name had an extra 6 at the start, and so the address would be resolving as 6 6 Avenue du Parc, which is likely why Facebook couldn't find it. It was also using "Quebec" (full) as the province whereas we should use 2 letter abbreviations (QC).

I've updated these now and it should soon show up if Facebook pulls OSM data again. If not, it is likely a Facebook addressing issue and not something we can fix here.