Failed to start Laravel Homestead on Windows (grep error)

I have to point out up front that I am mostly Linux illiterate - I am a Windows user, I would love to try the Hack language and that seemed like the fastest way to get up and work.

I followed this series of tutorials and got to the point of running a configured image.

When I run homestead up

or homestead provision

, it crashes with the same error message:

Rasmus Schultz @ SIDEWINDER-7240 ~
$ homestead provision
==> default: Running provisioner: file ...
==> default: Running provisioner: shell ...
    default: Running: inline script
==> default: grep: unrecognized option '---- BEGIN SSH2 PUBLIC KEY ----
==> default: Comment: "RasmusHomestead"
==> default: AAAAB3NzaC1yc2EAAAABJQAAAQEAhJ4eUnXFP7dCX98KtqNoZI9WwkE0 + EBfuggt
... snip ...
==> default: bVlGxJAHJd6u0vW9fssohiaUuo + 8i48zHn8Ciqs5XVAn79m / PQ ==
==> default: ---- END SSH2 PUBLIC KEY ----
==> default: '
==> default: Usage: grep [OPTION] ... PATTERN [FILE] ...
==> default: Try 'grep --help' for more information.
==> default: ---- BEGIN SSH2 PUBLIC KEY ---- Comment: "RasmusHomestead" AAAAB3NzaC1yc2EAAAABJQAAAQEAhJ4eUnXFP7dCX98KtqNoZI9WwkE0 + EBfuggt 
... snip ...
bVlGxJAHJd6u0vW9fssohiaUuo + 8i48zHn8Ciqs5XVAn79m / PQ == ---- END SSH2 PUBLIC KEY ----
==> default: Running provisioner: shell ...
    default: Running: inline script
==> default: / tmp / vagrant-shell: line 1: /home/vagrant/.ssh/$2: ambiguous redirect
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.

I've tried updating Composer, Homestead, Vagrant, VirtualBox, Homestead box image, whatever I could think of - I'm sure I'm all up to date.

Rasmus Schultz @ SIDEWINDER-7240 ~
$ homestead
Laravel Homestead version 2.0.17

Rasmus Schultz @ SIDEWINDER-7240 ~
$ homestead update
==> default: Checking for updates to 'laravel / homestead'
    default: Latest installed version: 0.2.6
    default: Version constraints:
    default: Provider: virtualbox
==> default: Box 'laravel / homestead' (v0.2.6) is running the latest version.

Rasmus Schultz @ SIDEWINDER-7240 ~
$ composer global update laravel / homestead
Changed current directory to C: / Users / Rasmus Schultz / AppData / Roaming / Composer
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating autoload files

Here's my Homestead.yaml

file:

---
ip: "192.168.10.10"
memory: 2048
cpus: 1
provider: virtualbox

authorize: C: \ Users \ Rasmus Schultz \ .ssh \ RasmusHomestead.pub

keys:
    - C: \ Users \ Rasmus Schultz \ .ssh \ RasmusHomestead

folders:
    - map: C: \ workspace
      to: / home / vagrant / Code

sites:
    - map: test.dev
      to: / home / vagrant / Code / test
      hhvm: true

databases:
    - homestead

variables:
    - key: APP_ENV
      value: local

This error grep

looks like an internal problem inside the field when it is initialized - as if the grep command is being issued?

What gives?

UPDATE:

Ok, the first issue is resolved - it was expecting a different key format, but that didn't fix the "ambiguous redirect" error ... assuming I need to resubmit? I shut down the tramp and started again with no luck.

$ homestead provision
==> default: Running provisioner: file ...
==> default: Running provisioner: shell ...
    default: Running: inline script
==> default: Running provisioner: shell ...
    default: Running: inline script
==> default: / tmp / vagrant-shell: line 1: /home/vagrant/.ssh/$2: ambiguous redirect
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.