Hello @khushboo.kumari
Like I have mentioned in the https://community.developers.refinitiv.com/questions/85373/is-login-required-before-listening-to-data-if-its.html post, the application needs to log in to the Refinitiv Real-Time before request data. Regarding how to get a list of item names question, please refer to this old post and the How can I get a list of all RICs available on Refinitiv Real-time? article.