Hi @Trinath_Putchala , welcome to the Atlassian Community and thanks for your post.
The premium tier of Jira only applies to the product of Jira. So, if you want to give product access to Confluence, you would need to allocate a license seat for Confluence or Jira Product Discovery to that user.
I hope this helps you but if it's not still clear, please feel free to ask other questions.
Best wishes
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