Topdesk offers users the possibility to share incident tickets with other people at UZH. You can open an existing incident in the Self Service Portal under the tile "My requests/Meine Anfragen". Within the incident, you can then link other people from UZH to this incident via the "Share/Teilen" button.
Tickets shared in this way can also be opened and edited in the SSP by all "shared" persons. Unfortunately, this is not possible for "Changes".