Hi @MG15,
Reporting on this is surprisingly complicated. HubSpot doesn’t keep track of whether a record is a first or a last.
You can set this up going forward by creating a contact-based workflow that sets the value of a custom date properyt (e.g. “First ticket submission date”) to the date of the stap when Number of associated tickets is 1. (“Number of associated tickets” is also a custom property you would have to create using calculation properties, see here.)
Historically, you could populate this date by exporting contact and ticket information and performing some Excel magic. The idea would be to identify the earliest Create date of a ticket for each contact and then import this Create date into First ticket submission date into the associated contact.
Best regards!