If your ticket has already been issued, the e-ticket receipt will show the charge, if any, for the first and second bags. That is what the agent will see at check-in. You can also look this up for your specific ticket on the UA baggage calculator or for a generic ticket between two locations on the same calculator. By way of example, a Y ticket between two random Micronesia airports gets one bag free with no status. Awards are no different than cash tickets in this resect, they are simply paid for with "miles" rather than cash.
https://www.united.com/CMS/en-US/tra...edBaggage.aspx