AT+QMTCFG? Error Response

ATI

Response:
Quectel_Ltd
Quectel_MC60
Revision: MC60CAR01A12

AT+QMTCFG?

Response:
ERROR constant

I am unable to configure SSL for MQTT.
AT+QMTCFG=“SSL”,0,1,2
gives random response

Hi
This function is supported, I have sent you mqtt related instruction manual, please refer to the manual guidance