Pinterest cannot publish a product without a title. Error 106 fires for any row where the title field is empty or null, and those rows never reach the catalog.
The title column was either left blank in the source export, the column header was misnamed (Pinterest expects 'title' exactly, not 'name' or 'product_name'), or upstream PIM logic stripped the value when joining variants. Pinterest treats title as a hard-required attribute alongside id, link, image_link, description, price, and availability.