GeoVerify uses GPS to establish locations. It is not uncommon for GPS signals to be weak or non-existent inside malls, airports and some buildings. Or if you are in the shadow of tall buildings in cities.
I think that if GeoVerify finds your location on a map, but can not get a code, that it will eventually get a code once your WiFi signal is strong enough. I haven't tried that, but I think it will work. Please let us know.
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008