If there are multiple agents replying to a ticket, you could be notified regarding that within the ticket as well. There would be a "Pen" icon on the top-left side within a ticket. If the symbol displays a number, it would mean that those many agents are currently replying to the ticket and you could click on the icon to view the agents' names.
If you signed up before Aug 9, 2021, please click Previous plans to view your applicable plans.