Hi, thanks for your reply. Ok , that is how I solved it: I reactivated a simcard from Spain and I registered this new phone on the duo app because this sim card also works here on roaming. Thus , I have guarantee that I will be authenticated in the duo app. because I try to figure out if with just internet connection (but the US simcard not working in Europe, it only works in the US, Mexico and Canada) if I could generate codes in order to get pass duo, and it does not work. So, good that I had this sim card with me and could reactivate from here. Otherwise, imagine that the day of the exam arrives and I cannot login...
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