Ansible Fails at Copy project template

I agree with the output:

Please verify ... you have SSH forwarding set up correctly.
More info:
https://roots.io/trellis/docs/ssh-keys/#cloning-remote-repo-using-ssh-agent-forwarding

As the listed link mentions,

  • ensure that your ssh key is added to your ssh agent
    • list currently added keys: ssh-add -l
    • add keys: ssh-add
  • and — since you’re on MacOS — ensure the key’s password is imported into your Keychain: ssh-add -K

In addition, if you’re on MacOS Sierra, be sure your ssh agent isn’t “forgetting” your keys: