Starting off with a new Nerves Project -- Issues with SSH

Questions & Help Questions
1

I recently started a new Nerves application with my Raspberry Pi 3, using the mix nerves.new command. I believe it sets up with Nerves Pack. I have it connected to my home Wi-Fi network alongside my Mac.
I can access it through my display and a keyboard, plugged into a power supply, but I cannot ssh into it for the life of me, and I have no idea why.

My configurations are below:

Nerves firmware: built with
MIX_TARGET=rpi3 mix firmware

VintageNet config (in config.exs):

config :vintage_net, :config,
  {"wlan0", %{
     type: VintageNetWiFi,
     vintage_net_wifi: %{
       ssid: "MY_SSID",
       psk:  "MY_PASS"
     },
     ipv4: %{method: :dhcp},
     hostname: "nerves-3ff8",
     domains:  ["local"]
  }}

MdnsLite config (in the same target.exs):

config :mdns_lite,
  hosts: ["nerves"],
  ttl:   120,
  services: [
    %{protocol: "ssh",      transport: "tcp", port: 22},
    %{protocol: "sftp-ssh", transport: "tcp", port: 22},
    %{protocol: "epmd",     transport: "tcp", port: 4369}
  ]

What I’ve verified on the Nerves device

$ ip addr show wlan0
3: wlan0: <…> 
    inet <IP> brd <IP> scope global wlan0
$ weather
...shows local weather information

What I have tried

ssh nerves.local
ssh root@nerves.local
ssh nerves-3ff8
ssh root@nerves-3ff8
ping IP

and all of them return:
connect to host nerves-3ff8.local port 22: Undefined error: 0

I can ping from within the nerves iex however.

Can anyone point me towards a solution? Im assuming a network issue? but Im not quite sure.