Currently the $secondary_menu variable returns an array, not html. This is because it wasn't rendered by any preprocess funcntions.
To make it work, look in template.php, sky_preprocess_page(), line 81. That's where $primary_menu is rendered. You can just copy those lines replacing 'primary' for 'secondary'.

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Jacine’s picture

Jacine
she/her
Location New York
CreditAttribution: Jacine commented
Status: Patch (to be ported) » Closed (fixed)

Sorry for such a late response, but I think you are talking about secondary links, which have been removed from printing in the theme so I'm not sure this applies anymore.