aerocommerce/csv /api Vanity Slugs not importing

1. upload csv with model, vanity_slug and slug. 2. Map the fields accordingly and import Expected result: Products updated with the vanity slugs imported. Actual Result: no changes to the products and slugs left blank. I have tried various combinations and included names and skus in the CSVs but just not having any result with them updating. Example API request and response attached.