Hello @Sneha A S ,
Your Jira Cloud instance has to be able to send and receive data to and from your app.
Therefore, yes, you need to start both:
Finally, please notice that this is not be the best place to get help on development related questions. In case further help will be needed on this topic, you might want to refer to the resources listed in https://developer.atlassian.com/resources:
We’re excited to introduce external collaboration for Confluence, now available in early access. It is available to preview for Confluence Cloud Premium and Enterprise customers. (If you're not on ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events