I had a similar problem in Berlin with LH. I was *G, but did not have my United card, they would not accept the boarding pass, so they would not let me in. I then showed my United Club card, but they said that the United Club card did not entitle access. They pulled out this fifteen year old placard that had a Continental Presidents Club and United Red Carpet Club cards on it. They said mine did not match any of the cards on their placard, so i could not enter. After I asked for a supervisor, they let me into the Senator lounge because it “was not crowded”.