I’m sure your nfc card/phone works great in Germany but it’s worth noting that part of the reason is that your card is likely Mastercard/visa. Here in the Netherlands tap and pay is also seamless with maestro cards… but the moment you try to use it internationally, POS machines reject it (“out of network” or something). If you have a diner’s card or an American Express card you might notice how many terminals/pos’es reject those as well.