I didn't book a fare/package that included a bag. Also, it's not related to my corporate travel - that system is very clear I'll be charge for first/any checked bags (and that's how it's always worked based on personal/team experience).
When I log in and view my reservation it has the table showing $0 for my first bag. However, when I view my actual ticket, it does have $25 as the first bag fee. Strange. It seems as if my reservation/booking is confused and perhaps showing me getting a "free bag" due to my MileagePlus account being linked to my credit card. I'm pretty sure the ticket rules will override that. I do want to check a bag, but it seems that due to this I have no option to pay for that online in advance.