Originally Posted by
larrythai
Despite a big sign in front showing STAR ALLIANCE GOLD, I was not admitted as I had bought a ticket on THAI SMILE.
Unfortunately correct - Smile is (in theory) a separate airline that is not a part of *A - this was discussed on this form a few times. You need to book TG metal under TG code to get lounge access (BUT... why do you even try to get access to the domestic lounge? Limited food, no Singha etc.).