cannot return OK when configuring DN command using SCM

I’m trying an experiment on the data transmission between Coordinator and End device.the module is xbee-pro ZNet 2.5,the board is made by myself,I have used it with the xbee-pro serial 1 and it’s no problem.
when running the code on processor, I find it cannot configure the DN command.but when on-chip debug, it’s no problem!
I also configure other command,it’s ok! only the DN have problem.
Can anyone tell me how to resolve it? Thanks!

My apologies, it does work. I had accidentally put a space in front of the NI name.

Furthermore, the ND command actually returns the 64 bit address, but in the description, it is called the serial number. The serial number and the 64 bit network address is the same thing.