One Click List-Unsubscribe NOT adding unsubscribe header link to Gmail header

Hi,

We are trying to implement One Click List-Unsubscribe for Gmail & Yahoo for our customer emails, we deployed the required changes for typology rules & typology and also added the same into our Email delivery properties, but on sending proofs and mails to our Gmail Email ids, we are still NOT seeing the Unsubscribe header.

Secondly, in case unsubscribe header is visible, what would be the next steps to verify and confirm if the recipient is actually Unsubscribed, where can we check that in our database schema

As we are using custom recipient schema, so is there any modification required in List-Unsubscribe Web app.

Appreciate any help on this.

Thanks