why my Ec25-A module does not work the MQTT commands?

IoT Modules LTE Standard Module
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hi,AleMario:
I have tested it to be normal
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Good afternoon Herbet, try again and it sends me an error from the command AT + QMTCFG =? I don’t know what the steps are before sending MQTT AT commands.

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hi,AleMario:
Are you the result of manual execution or MCU program execution?
If there are still exceptions, I recommend that you manually debug through the module’s serial port.