Facebook API - FB.api() call works but AJAX request does not

Facebook API - FB.api() call works but AJAX request does not

I have an issue where I make a request as:
FB.api('/me', function(response) {
console.log('Good to see you, ' + response.name + '.');
});
And the request succeeds. However, when I manually do the call via AJAX to:
https://graph.facebook.com/100000673883864/me?access_token=CAAIqk2q3UU8BAMZ…xj6wOEy0gHNsvK9JoeE9uYsSDSOZAcOJO0x9igOyhuCkm2lfKkVsta5tW1KOurvphX2zzR4sZD
I got a 400 and an error saying Invalid OAuth Token.
Any idea why?