Unable to connect with TLS on PHP 7.4

[danielnguyen1612]

Hi all, I'm trying to connect to Elasticahe Memcached with TLS on PHP 7.4. I already installed PHP extension which downloaded from AWS Console. But I am getting these errors (it does not happen with extension on PHP 8.2)

Fatal error: Memcached::createAndSetTLSContext(): Failed to create/set TLS context: Client cert and key must both be specified

These are my code for your reference

$client = new Memcached();
$client->addServers([
   ...
]);

$client->setOption(MemcachedDriver::OPT_USE_TLS, 1);
$client->createAndSetTLSContext([
    'hostname'             => '*.....',
    'skip_cert_verify'     => false,
    'skip_hostname_verify' => false,
]);

$client->set('test_memcached', 'memcached');

Thanks you in advanced