Obviously there are agents in the team, but the ticket is not assigned to an agent, because with an assigned agent it would look like this:
Assigned to: Test_team/test_agent
or this:
Assigned to: Test_agent/test_team
I also wondered the first time I saw this at osTicket and found it also confusing that I did not receive any "ticket assigned to you" alert since it was still assigned to some other agent from another department which needed our assistance and so assigned it to our team (containing several agents from 2 departments). After a colleague then assigned it to me, I received the mail, but I also think that this is definitely confusing - you can assign a ticket to an agent and a team, but only get an alert mail when it was assigned/re-assigned to an agent and not to the team. If this is not the behavior as its intended, I guess that's maybe a bug. Would be great if you can enlighten us @[deleted] ;)
PS: Answering from the phone, so I can't include a screenshot how our ticket with the "assigned to: team/agent" looks like.