Access Outlook email in PHP using imap and OAuth - php

Question

Due to Microsoft removing Basic Auth from IMAP connections, we are converting our PHP code to use microsoft's oauth api and the external library: php imap.
We have managed to successfully get the access_token using the api and provide it to the library like so:
It works fine for two consecutive runs of the script, but for some reason, any time i run the same code after that, it doesn't let us connect, it returns an operation timeout error.
Error:
stream_socket_client(): unable to connect to ssl://outlook.office365.com:993 (Operation timed out) in php-imap/src/Connection/Protocols/Protocol.php:204
Code:
$instance = new ClientManager();
$this->client = $instance->make([
'host' => "outlook.office365.com",
'port' => 993,
'encryption' => 'ssl',
'validate_cert' => false,
'username' => $this->mailboxUsername,
'password' => $access_token,
'protocol' => 'imap',
'authentication' => "oauth",
]);
try {
// Connect to the IMAP Server
$this->client->connect();
}catch (Exception $e) {
echo 'Exception : ', $e->getMessage(), "\n";
}
private function getAccessTokenUsingRefreshToken()
{
$CLIENT_ID = $this->azure_settings['client_id'];
$CLIENT_SECRET = $this->azure_settings['secret_value'];
$TENANT = $this->azure_settings['tenant_id'];
$REFRESH_TOKEN = $this->azure_settings['refresh_token'];
$url = "https://login.microsoftonline.com/$TENANT/oauth2/v2.0/token";
$param_post_curl = [
'client_id' => $CLIENT_ID,
'client_secret' => $CLIENT_SECRET,
'refresh_token' => $REFRESH_TOKEN,
'grant_type' => 'refresh_token'
];
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_POSTFIELDS, http_build_query($param_post_curl));
curl_setopt($ch,CURLOPT_POST, 1);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
// ONLY USE CURLOPT_SSL_VERIFYPEER AT FALSE IF YOU ARE IN LOCALHOST !!!
// NOT IN LOCALHOST ? ERASE IT !
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, false);
$result = curl_exec($ch);
$access_token = json_decode($result)->access_token;
return $access_token;
}