Originally Posted by
ffsim
*G have not had access to UC on domestic UA flights for the past several years at least. I think that's where a lot of the confusion comes from... the lounge agents often look for "INTL" on AC boarding passes whereas they should just honour the *G entry requirements. It looks like that's likely what happened to OP.
Strange, I always remember it being non-UA*G being allowed UC access on domestic UA flights...