Right, but I’ve seen a few folks (including at least one person in this thread) saying they’ve been using it successfully for a while now with no problems at all.
I also have multiple cards in my wallet app, and am having the same problems. However, maybe those who aren’t having any problems only have a single card. Just random speculation, since the error talks about multiple cards being detected…. However, it also doesn’t really make sense when I think about it, because the Apple Watch or iPhone shouldn’t be presenting more than one card, yet the terminal is clearly seeing something that makes it think that … and only when Express Pay is used.