LAUNCHCC3220MODASF: mqtt_client_over_tls example code : MQTT connect failed: -2006

hi,
I am testing the mqtt_client_over_tls example code to publish a dummy message to our Azure cloud platform, for which I add "DigiCertAssuredIDRootG2.crt.pem"  to the user file and change the global variables.



and change mqtt source file to char *MQTTClient_secureFiles[1] = {"DigiCertAssuredIDRootG2.crt.pem"}; , but I am unable to establish connection with our azure mqtt server and I am getting the following error

============================================
MQTT client Example Ver: 2.0.3
============================================

CHIP: 0x31000019
MAC: 2.7.0.0
PHY: 2.2.0.7
NWP: 3.22.0.1
ROM: 0
HOST: 3.0.1.71
MAC address: 10:ce:a9:47:bc:8f

============================================
[WIFI::INFO] [SlWifiConnEventHandler] POWERED_UP
[WIFI::INFO] MAC address: 10:ce:a9:47:bc:8f
[WIFI::INFO] [Event] STA connected to AP - BSSID:14:a7:2b:74:db:d1, SSID:Inthings
[WIFI::INFO] [NETAPP EVENT] IP Acquired: IP=192.168.1.18 , Gateway=192.168.1.1
[SlNetConnEventHandler] I/F 1 - CONNECTED (IP LEVEL)!
[SlNetConnEventHandler] I/F 1 - CONNECTED (INTERNET LEVEL)!
[SL-MBEDTLS::INFO] . Connect on tcp/*/4433 ...

startSNTP: Current time: Thu Sep 21 10:28:15 2023

[MQTT_APP::INFO] Subscribed to all topics successfully

[MQTT_APP::INFO] Wi-Fi connection is UP
[SL-MBEDTLS::INFO] InitTlsSocket:: sd=1, pTlsSock=2000c1a0 slSock=1

[SL-MBEDTLS::INFO] SlNetIfWifi_close:: Listener Socket 1 was removed

[MQTT_IF::ERROR] connect failed: -2006

[MQTT_APP::INFO] MQTT_EVENT_SERVER_DISCONNECT

[MQTT_APP::INFO] MQTT_EVENT_DESTROY