Had same issue again (I'm using up previous travel credits so have to continue with no middle name, so 016 ticket bought directly from UA.com)

phone call during T-1 check, no luck, told me to figure it out at physical check-in.

Premier access, agent and supervisor couldn't do anything. Agent did put the priority orange tag (even though the printed label didn't say priority). But priority bag is misnomer anyways
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UC lounge, Scanning BP at automated gate said no access, didn't allow me toscan my *G . Didn't try scanning *G first. Went to the lounge check-in desk. This agent couldn't do anything, only manaully entered my OZ *G (so that UA gets paid for access).

Inside the lounge, the help desk spent 10mjn fixing it (unchecked me in, updated my name with middle name, re-checked me in, then it worked). Luggage didn't get lost, eventually came out at my destination.

Will check if miles get automatically posted (usually takes 1-3 days).


Basically, it's possible for someone at UA to fix it. Just don't count on being able to find that person