Get user's first name and store in local variable when user logs in.

I added more columns in the user collection to store additional details about the user. Now, when someone signs in, I am trying to get their first name and save it as a local variable for further use. In order to do that I added a new parameter in the response section of built-in user login database service. But when I test it, the response only shows the userid and the session token, but not the parameter I added. I don't get it !
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