If a product is flagged as ineligible or gated in SAS, you will be alerted to this in the Quick Info and Alerts panel:
It's worth checking that you are signed into Seller Central with the correct account (guide here) and that your account has the correct permissions (guide here).
To learn about gated products, check out our blog post here - if you're ready to go and find some auto-ungated products, check out our other blog post here!