The scarlet has a driver that can help with the routing through a daw or something like this while recording. I'm thinking your computer isn't recognising the Scarlett as a interface that can input audio. The NT1 requires Phantom power to work, +48v if you didn't know. So if the switch of the phantom power isn't engaged, it probably means that the NT1 isn't even used.
Scarlet is really plug and play kinda interface. Plug your scarlet, open 48v after connecting your mic (It could do bad thing to your mic if you open the 48v before, but heh, it's more a myth than anything else imo, you need to be really unlucky to break a mic cause of 48v short circuiting into the ground of the mic and wrecking the diaphragm) Then in your daw select you scarlet as input and output if you have headphones or stuff like this plugged in you scarlet, select the scarlet. Do your gain with your scarlet and listen to it and look at the meters in your daw so you don't saturate your sound. and that's it. After that record