Laravel Passport - Grant Type Not Supported
<p>I have installed Laravel Passport per the documentation and I have modified all areas of my code that is required.  </p>

<p>I am working on setting up Password Grant Tokens so that users will be able to get an API token when logging in with their username and password for the site.  I am hitting an issue though when it comes to the grant_type.
For some reason Laravel is complaining about an invalid grant type.</p>

<pre><code>{
  "error": "unsupported_grant_type",
  "message": "The authorization grant type is not supported by the authorization server.",
  "hint": "Check the `grant_type` parameter"
}
</code></pre>

<p>These are the fields that I am posting to <code>/oauth/token</code></p>

<pre><code>client_id = 4
client_secret = SMiYE7XqDNtXKQnmkYmFnXxfAaV83vRhnJ9zwCtZ
username = jcrawford@domain.com
password = **************
grant_type = password
scope = *
</code></pre>

<p>I have run <code>php artisan passport:install</code> and I have also tried running <code>php artisan passport:client --password</code></p>

<p>Both commands worked and both created the client and secrets, however, I cannot seem to get past the error about the grant_type.</p>

<p>Any suggestions on what I should look at to get this solved so that Password Grant Tokens will work for me?</p>