Not receiving verification texts on new iPad mini

My new iPad mini doesn't receive any verification texts from any website or app. I still get them my iPhone and old iPad mini. In fact, the verification codes get sent to the old iPad mini and my iPhone, when I'm using the new mini. If I then enter the code received on one of the other two devices, then I'm let in on the site on the new mini. This is for all apps and desk top sites. Otherwise, my text works perfectly fine on the new mini, just not for two step verification. I've spent hours googling a fix, but haven't seen anyone else experience my particular problem. There are no blocks set up that I am aware of, an again this happens on all websites and apps that require two-step verification. Someone at the Apple Store told me that should't happen, but of course it is. Please help. Thank you!