AT+QHTTPPOST is not working

I have been using M66 for a while and I’m trying to post some JSON data to Firebase but it is showing error +CME error 3804 everytime.

The AT commands that I used are,

AT
AT+CPIN?
AT+CREG?
AT+CFUN=1
AT+QIFGCNT=0
AT+CGDCONT=1,"IP","WWW""
AT+CGATT=1
AT+CGACT=1,1
AT+CGPADDR=1
AT+QIFGCNT=0
AT+QICSGP=1,"CMNET""
AT+QIREGAPP
AT+QIACT
AT+QHTTPCFG="contextid",1"
AT+QHTTPCFG="requestheader",1"
AT+QHTTPURL=107,50

serial.print(“https://firebaseserverurl.json”)

AT+QHTTPPOST=10,60,60

serial.print({“age”: “30”,“name”: “John”})

What exactly leads to this error and how can I fix this error?