Does anyone have any idea why this is? It has not happened to me, but apparently that's really the case, that the Travel Card has less acceptance than the normal Debit Mastercard. The combination "Magstripe + Offline" may well be due to the 221 service code, if I understood correctly.
Otherwise it should work but yes. But in the supermarket, restaurant, and also in the Thalys (where apparently offline, but EMC is), it has already caused problems for some users.
Is it in the end what with the BIN? Is there somehow blacklists on PSPs or something?