AT command Yeastar TG 400

Hello. I need to run the command:

Action: Login
Username: **********
Secret: ************

Response: Success
Message: Authentication accepted

Action: Command
command: gsm send at 2 AT+CCFC=0,3,+*****************

Response: Error
Message: Permission denied

How do I allow a user to execute AT commands?

Thanks in advance for the answer.

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