FYI for anyone else that may be experiencing this. My wife and I both consolidated our student loans a couple of months ago, and they were previously serviced by Nelnet. They managed to update Experian and Equifax, but Transunion showed no updates for either of us. In fact, for both of us, Transunion hadn't been updated in 6 months.
I used the chat feature on their site to ask them to report the update to TU. They claim they already did on MM/DD/YYYY and tried to pass me off to them. I then asked them to "open a research ticket to have this information resubmitted to Transunion" and they did as requested without further pushback. A few days later my wife's TU file was updated and I'm working on mine now.
For anyone having this problem, I recommend calling or chatting and following these steps.