Im unable to discover XBEE module which is connected to controller

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I’m new to xbee, Im trying to discovering xb8 -DM modules using XCTU tool, getting AT COMMAND response frame(0x88) in that command is KZ and response status is INVALID COMMAND.what does it mean?.Is it applicable to XB8-DM modules?

What is the full part number of the XBee module you are working with and what firmware version is installed?