This probably relates to your previous questions about using your works license at home...
Have you used this once at home? No? That's why... Adobe want confirmation you are allowed to use it.
Sign in through CC once and your done, assuming you don't have more than two computers logged in to your two seat licence... I have three puters on a two seater (I have printers in two different locations) and have to switch out when I'm at home, but once logged in you stay "blessed" until I kick myself out on another puter.