High Speed from Rome

Originally, I found a train on Trainline departing at 10:50 from Roma Termini direct to Verona Porta Nueva arriving at 2:08 pm.  I reserved it with protection, thinking when Eurail published its high-speed trains I could reserve seats there and cancel the Trainline reservation.  Now I still do not see anything available on Eurail for the HIGH-SPEED trains matching the schedule I have already reserved on Trainline.  My concern is whether my Trainline reservation will be good or why Eurail is not showing the route I have already reserved elsewhere?

If you’ve bought something on Trainline, then you’ve bought a full ticket. They don’t sell standalone reservations.

The ticket will be valid; they might or might not inform you about the new timings.

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There is no direct 1050 unfortunately, if there ever was. You can always check the definitive times on the operator’s website: Trenitalia.com. Everything else - Trainline, Eurail, other ticketing agencies, will update their timetable from Trenitalia.

There's no point in booking a ticket first and then booking a reservation and cancelling the ticket.

Once you can book a regular ticket, pass reservations are also available. If not on the Eurail website, then surely elsewhere, see this page:

https://www.seat61.com/interrail-and-eurail-reservations.htm

The timetable has been published on the Trenitalia website, so it's your choice what you do now.