AT Commands on Debug UART of MC60

I would like to use the Debug UART on MC60 to send AT commands.

But I am currently experiencing an issue with my Quectel MC60 module. When using the QCOM Tool, AT commands work perfectly. However, when I switch to using the STM32 UART, the AT commands do not function as expected. The ATI command works, and returns an OK response as expected. But following commands are resulting in an ERROR:

AT+QIFGCNT=0

AT+QIREGAPP

AT+QIACT

I am trying to establish a MQTT connection using AT commands.

The MC60 Device has AT Command Firmware with version MC60CBR01A02 flashed on it.

The MC60 is connected to STM32 via Debug UART.

Could you please provide guidance or suggest any troubleshooting steps that might help resolve this issue?