CRLP command not working for M66 Module


I am working with Quectel M66 module. I am not getting the response of the AT+CRLP command. Network connection and other controls are working properly. What is the reason why I do not receive the response of the CRLP command, how can I solve this problem? Can you help me?

[2023-06-01 15:18:24:388_S:] AT+CREG?
[2023-06-01 15:18:24:450_R:] AT+CREG?
[2023-06-01 15:18:24:450_R:] +CREG: 0,1

[2023-06-01 15:18:24:450_R:] OK
[2023-06-01 15:18:29:514_S:] AT+CGREG?
[2023-06-01 15:18:29:575_R:] AT+CGREG?
[2023-06-01 15:18:29:575_R:] +CGREG: 0,1

[2023-06-01 15:18:29:575_R:] OK
[2023-06-01 15:18:37:754_S:] AT+QISTAT
[2023-06-01 15:18:37:809_R:] AT+QISTAT
[2023-06-01 15:18:37:809_R:] OK

[2023-06-01 15:18:37:809_R:] STATE: IP INITIAL
[2023-06-01 15:18:46:162_S:] AT+CPIN?
[2023-06-01 15:18:46:223_R:] AT+CPIN?
[2023-06-01 15:18:46:223_R:] +CPIN: READY

[2023-06-01 15:18:46:223_R:] OK
[2023-06-01 15:18:54:724_S:] AT+CRLP?
[2023-06-01 15:18:54:784_R:] AT+CRLP?
[2023-06-01 15:18:54:784_R:] +CME ERROR: unknown
[2023-06-01 15:18:57:093_S:] AT+CRLP=?
[2023-06-01 15:18:57:144_R:] AT+CRLP=?
[2023-06-01 15:18:57:144_R:] +CME ERROR: unknown

We do not use this command much, you can try to establish a tcp/http connection first, and then send this command query