Apologies for reviving an old thread but was searching for enlightenment on this forum. Was just challenged on access when bringing in my two young children and wife into the Schengen lounge (empty at 05:40 on a Saturday morning) none of whom are Elite Plus. Access was even confirmed on the KLM app (green tick under the lounge access) but they still made a fuss, took screen captures of the confirmation on my phone and told me they would let me in on exception. So unpleasant.