Why don't I get verification texts sent to my Grasshopper number?

Grasshopper numbers cannot receive short-code text messages at this time. Short codes are the 5 or 6 digit numbers that send you verification codes from sites like Google, Amazon, Facebook, Instagram delivery notifications.

Short codes, short numbers and short digit sequences can only be sent to numbers provided by wireless carriers right now. Since Grasshopper isn't a wireless carrier, we're not able to support sending messages to or receiving messages from short codes.