why do functions fail when they actual succeed?

echo "Script Started\n";

$data = [
    'personalizations' => [
        [
            'to' => [
                ['email' => $to]
            ]
        ]
    ],
    'from' => ['email' => 'maurice.volaski@einsteinmed.edu'], // Replace with your email
    'subject' => $subject,
    'content' => [
        [
            'type' => 'text/plain',
            'value' => $text
        ]
    ]
];


$ch = curl_init();


curl_setopt($ch, CURLOPT_URL, 'https://api.sendgrid.com/v3/mail/send');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Authorization: Bearer ' . $apiKey,
    'Content-Type: application/json'
]);

$result = curl_exec($ch);


if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}

if (curl_getinfo($ch, CURLINFO_HTTP_CODE) === 202) {
    echo 'Email sent successfully.';
} else {
    echo 'Error in sending email: ' . $result;
}
echo "Script Ended\n";
curl_close($ch);