usersMeOrganizationsGet return null

[RehArk]

Hello,
I’m having a small issue with UtilisateurApi::usersMeOrganizationsGet. The function always returns null. Am I doing something wrong?

Here is my code:

        $baseUrl = 'https://api.helloasso-sandbox.com';

        $provider = new GenericProvider([  
            'clientId'                => $client_id,  
            'clientSecret'            => $client_secret,  
            'urlAccessToken'          => $baseUrl.'/oauth2/token',  
            'urlAuthorize'            => '',  
            'urlResourceOwnerDetails' => ''  
        ]);

        $accessToken = $provider->getAccessToken('client_credentials');

        $client = new Client();
        $config = Configuration::getDefaultConfiguration()
            ->setAccessToken($accessToken)
            ->setHost($baseUrl.'/v5')
        ;

        $apiInstance = new UtilisateursApi(
            $client,
            $config
        );

        $organizations = $apiInstance->usersMeOrganizationsGet();

        var_dump($organizations); // always null
        die;