Pulse Extranet PIN code

I have mobile phones connected to Pulse. One is at the property for managers to keep, and the other is mine. When logging in to the Extranet, the verification page comes up and when I try to verify using the Pulse App extranet pin code option, on one phone it works and on the other, I get an invalid code error.  The phone that works is an android and the one that doesn't is an iPhone. Please advise.