If the Tickets page is dimmed, empty, or missing, one of three things is true. Work through them in order.
1. Tickets are turned off
If tickets have not been turned on for this app, the board is greyed out. An admin turns them on with the switch in the Tickets page header. See the article on turning tickets on or off.
2. Your plan does not include tickets
Tickets need the Business plan. On a lower plan the page shows "Tickets are available on the Business plan" over a greyed board. Upgrade to use them, and compare what each plan includes in Compare Mando plans and pricing.
3. Your account does not have access
If you are a Member without the Tickets capability, the Tickets entry does not appear at all, and opening the link directly shows an empty page with no explanation.
Ask a Super Admin or Admin to grant you the Tickets capability. See the article on giving team members access.
If none of these apply and Tickets is still missing for an admin on a paid plan, it may not be switched on for your workspace yet; contact us. For other dimmed controls, see Why some settings and buttons are greyed out via your roles: Understand Super Admin and Member roles.