Azure AD Authentication in my Laravel Web App

Hey guys,

I am trying to add Authentication with Azure AD to my Laravel Web Application, hosted on IIS. I followed the instructions in the following Link as precise as possible: https://github.com/Azure-Samples/active-directory-b2c-php-webapp-openidconnect I don't have acces to the policys so i had to remove the policy_name in the getMetadata Function in the Endpointhandler

public function getMetadata($policy_name) {
        require "settings.php";
        $metadata_endpoint = $metadata_endpoint_begin; // . $policy_name;
        $this->metadata = $this->getEndpointData($metadata_endpoint);
    }

After i did everything in the instructions in the Link above and placed a Login-Button, which calls this function...

 public function login()
    {


        require app_path()."/Http/Controllers/settings.php";
        require app_path()."/Http/Controllers/EndpointHandler.php";

        // Set cookie for state
        $state = rand();
        setcookie("state", $state);

        // Redirect to sign up/sign in page
        $endpoint_handler = new EndpointHandler($generic_policy);

        $authorization_endpoint = $endpoint_handler->getAuthorizationEndpoint()."&state=generic"."+". $state;
        return redirect($authorization_endpoint);
    }

...I am getting this error when clicking the Button

Symfony \ Component \ Debug \ Exception \ FatalErrorException (E_UNKNOWN) Cannot redeclare getClaim() (previously declared in C:\inetpub\wwwroot\bcompetent\fleet_booking_test\app\Http\Controllers\EndpointHandler.php:6)

when i place "namespace App\Http\Controllers"; on top of the EndpointHandler.php and the TokenChecker.php i don't get this Error anymore and i get directed to this Link:

https://login.microsoftonline.com/ef7e48cb-7676-47e9-9a28-c69910d92560/oauth2/v2.0/authorize?response_type=id_token&client_id=3a0621c0-2848-47f5-83ee-bebeede8aaa6&redirect_uri=https%3A%2F%2Fbcompetent.bertrandt.com%2Ffleetbookingtest%2Fpublic&response_mode=form_post&scope=openid&nonce=c78c18a3-7ad7-4c17-a469-00fdadf35a3e&state=generic+861376380

where i can enter my Login-credentials, but after i did this i am getting the Error

Symfony \ Component \ Debug \ Exception \ FatalThrowableError (E_ERROR) Class 'App\Http\Controllers\Crypt_RSA' not found

Does anyone here have a Solution for my Problem? I have a feeling that it could have something to do with composer or with the providers in my config/app.php but i am just guessing, because i am very new to Laravel.

I am thankful for every kind of assistance