It's a technical violation, but the only time I've seen a name change be an issue is if you're selling the loan on the secondary market, as they will likely make sure the officer name matches the NMLS registry.
I would send the MLO an email along with the quick guide to updating their MU4R and ask for them to update their name or add an AKA by a certain date. If it's not done by that date, start adding management to the emails, as that can spur some action.
Rather than traditional disciplinary action, like verbal or written warnings, I would inform them that we will shut off their access to the loan origination software until their NMLS profile is updated appropriately. If that doesn't get them to act, nothing will.
HOWEVER - make sure they aren't out on FMLA or other extended leave, as that happened to me once and it was a bit embarrassing....
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All opinions are my own, not my employer's