If you can see the ticket when you access it directly, but not in your ticket filter, the problem must be your ticket filter. Could you double-check the criteria of your filter. You can hit New Tab and just tick System Administrators under Agentteam to see all tickets assigned to the team.
Keep in mind that, by default, you can only see tickets assigned to teams you're in. You can add yourself to additional teams by clicking in the Teams column next to your username under Configuration\User Access & Roles.