Not able to connect to AP from Quectel FC900E

Hello Team,
We are using Quectel FC900E Wifi/BT module. We are using Linux on the device. We are able to successfully bring up the module.
We are able to see the node for wlan0 using ‘ifconfig’ command. We also use the command ‘rfkill unblock all’ to unblock the Wlan and BT state.
We are able to scan the available AP nearby our device, but not able to connect any of the device which are with and without password. We are not using wpa_supplicant.
We are using below commands to scan the devices available.
‘iw wlan0 scan | grep -i SSID’
For connecting to specific SSID we are using below commands.
‘iw dev wlan0 connect SSID’
After using above command we see that the device is trying to connect the AP, but no logs are there in dmesg. Also we get notification of the device connected to our mobile device but it gets disconnected instantly.

Need your help to know if we are missing any process while connecting the device.

Thanks
Nilesh