I recently earned Sapphire status on Air Berlin. However, I am trying to get status on AA since I live in the US.

I have been denied access to lounges in the UK and Vietnam because my frequent flyer numer in boarding pass is for AA and not Air Berlin even though I showed my Air Berlin Sapphire card with an expiration of 2017. Did not seem to be an issue in the US. I looked at the rules and it doesn't appear that I should be denied access. Help!