@Ramya Gutta -
Welcome to the community. For add-on (i.e. Zephyr), it is typically set for 30 days for trial period. You will need to work with your Jira/JSM system admins to purchase the actual add-on after the trial period is over.
If you have any question on how to purchase the add-on, you can also reach out to Zephyr vendor for direct assistance.
Hope this helps.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Technology Applications Team
Viasat Inc.
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