some questions of nRF5340!

when i got a nRF5340 DK,

firstly,i use the vscode to open sdk and build ,

secondly,start to run the ncs2.1.2 sample (path:v2.1.2\nrf\samples\bluetooth\peripheral_uart),but when i  flash to  the DK ,and then i use my phone to scan the deivce ,it not found ,

finally i debug the program ,it is stop at the function--z_spin_lock_set_owner(l);

have somebody could tell me what i to ? so much thanks to you!

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