United has had the same issue for years, also there are a lot of front line airport people who don't want to extend *G benefits even with a card (violation of *A rules). The line is that they can't verify status because there isn't an actual expiration date on my card/screen shot (I'm Lifetime Diamond Plus, obviously still alive) along with the issue of the name formats aren't compatible. RNO, SMF and the international hubs seem to be able to make things work with a minimum of effort.

Happens to me all the time with company/government tickets since they're virtually all international and supposedly the name on reservation has to match the passport with the line that it's APIS requirement. I've asked several FIS/CBP agents who have generally called BS on that since they have to deal with the foreign passports at Immigration and it doesn't seem to bother them.