I'm a bit confused when it comes to use Priority Pass on arrival at European airports. On the PP website and app, it sometimes mentions 'valid boarding pass required' and sometimes it doesn't. That made me think you may use those lounges upon arrival as well. During the last months, I used lounges in Vienna, Madrid, Palma de Mallorca, Amsterdam and Frankfurt when arriving (and before picking up my bag). Sometime lounge agents asked for a boarding pass (which I then gave), sometimes just asked for a destination and mostly they asked for nothing. Today, I was told in Amsterdam that it's 'not always' allowed to use the Aspire lounge on arrival. It wasn't clear to me whether because the lounge has capacity problems or because it's not allowed by PP.

Does anyone here have the answer?