The "Inventory Database" page of the 1Ticket IMS displays all tickets that 1Ticket has seen in your various accounts. In general, this is all inventory that 1Ticket may be able to transfer.

If a ticket is eligible for 1Ticket Managed Delivery you will see an icon in the "1TMD" column:

What Does A Ticket Need To Be Eligible For 1TMD?

For a ticket to be eligible for 1TMD the Apple Wallet and Google Pay options must be available in the primary. If you can add the ticket to your phone it probably means that 1TMD will work.

1TMD will not work in cases where no ticket hast yet been released.