using PHP GraphApiClient GraphApiClient($requestAdapter) return Exception of "invalid_client"

Question

I'm using the sample php code from here:
https://github.com/microsoft/kiota-samples/blob/main/get-started/azure-auth/php/GetUser.php

But after calling $me = $client->me()->get()->wait(); there is an Exception with messsage "invalid_client"

Am is using the right clientId?
Is there something I need to setup in the Registered App?

My Setup

I set the variables with the testing account.

$tenantId = 'common'
$clientId = The registered app client value
$clientSecret = The registered app secret
$redirectUri = Same URL as the registered app redirect url
$authorizationCode = The authendicatied code returned from https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=MY_CLIENT_ID&response_type=code&redirect_uri=%20http://localhost:8000/homepage.php&response_mode=query&scope=User.Read

Answer 1

"invalid_client" is from an Exception message. That was all the information I got.

When I try to look at the State of the promise, it returns "rejected". So it see like there is someting on Azure AD that is not set up properly.

	$client = new GraphApiClient($requestAdapter);
	
	echo "Promise State: " . $client->me()->get()->getState();

I belive my test user is set up correctly to access the application

Is there any way to know the reason why it was "rejected"?