In a Trusted Tickets scenario, this stuff isn't tracked in the same tables in any useful way which would allow you to go in and understand who logged in via Trusted Tickets after the fact.
Mostly, the trusted-tickets related tables only hold "temporary" records. For example, when you ask for a ticket and Tableau Server issues one in response, a row is created in a particular table.
But when you use the ticket, that row is immediately deleted.
Please use the Ideas forum to make a feature request about this. I'd personally love to see the behavior change, but your request (as a customer) sometimes carries more weight than my opinion
Any ideas if this was implemented in any later versions?