PHP cURL to Laravel HTTP Client

Hello, I need help with a conversion from PHP cURL to Laravel HTTP Client.

I have this script:

$keyProvider = new \App\Models\OCIRequest();
$signer = new Signer;
$signer->setKeyProvider($keyProvider);

$url = 'https://iaas.sa-saopaulo-1.oraclecloud.com/20160918/images?compartmentId=ocid1.tenancy.oc1.xyz&limit=801&sortBy=TIMECREATED&sortOrder=DESC&lifecycleState=AVAILABLE';
$method = 'GET';
$headers = $signer->getHeaders($url, $method, null, 'application/json');

$curl = curl_init();

$curlOptions = [
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 5,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => $method,
    CURLOPT_HTTPHEADER => $headers,
];

curl_setopt_array($curl, $curlOptions);
$response = curl_exec($curl);
echo $response;
curl_close($curl);

This basically retrieve information from Oracle Cloud Infrastructure. The code runs fine using "pure php". However, using Laravel HTTP Client, I received an error (NotAuthenticated). This is the code I have used:

$keyProvider = new \App\Models\OCIRequest();
$signer = new Signer;
$signer->setKeyProvider($keyProvider);

$url = 'https://iaas.sa-saopaulo-1.oraclecloud.com/20160918/images?compartmentId=ocid1.tenancy.oc1.xyz&limit=801&sortBy=TIMECREATED&sortOrder=DESC&lifecycleState=AVAILABLE';
$method = 'GET';
$headers = $signer->getHeaders($url, $method, null, 'application/json');

$response = Http::withHeaders($headers)->get($url);
echo $response->body();

Any advice? Am I missing something? Thank you!