Here’s a step by step tutorial on how to identify follow-up tickets in Zendesk:
1. Open the ticket.

2. If the ticket shows as "Follow-up", this means it was raised as a follow-up to a closed ticket.

3. To find the original closed ticket, click on the ticket number.

4. This is your "closed ticket".

Congratulations! You just learnt how to identify follow-up tickets in Zendesk.