wpseo_primary_term_taxonomies filter not listing all registered taxonomies

I have two custom taxonomies that I would like to include in the ‘Primary Topic’ functionality. I followed the instructions in the documentation for the wpseo_primary_term_taxonomies filter, but it has no effect. When I output the $all_taxonomies parameter inside the filter to debug, it only shows the category taxonomy; it seems that none of my registered taxonomies are available to this filter and so can’t be added as options for the primary term. Any idea why this might be happening?

• This topic was modified 1 year, 5 months ago by matthewmcvickar.