Originally Posted by Cory6188

I generally agree, with the exception of at partner lounges in other countries, where I have had to show the card.

Just as an example, a few weeks ago, I was flying EDI-AMS on KL, and the agent at the 3rd party lounge in EDI wanted to see my physical DL Diamond Medallion card (which she matched to a list of eligible cards on her screen) before she'd let me in.