nrf54l15DK sys_poweroff() bus fault

I'm trying to get NFC power-up/restart working on nrf54lDK but the call to sys_poweroff() results in:

E: ***** BUS FAULT *****
E:   Precise data bus error
E:   BFAR Address: 0x0
E: r0/a1:  0x400cf000  r1/a2:  0x00000000  r2/a3:  0x00000001
E: r3/a4:  0x00000000 r12/ip:  0x00000000 r14/lr:  0x0007cd37
E:  xpsr:  0x81000000
E: Faulting instruction address (r15/pc): 0x0007ccb8
E: >>> ZEPHYR FATAL ERROR 25: Unknown error on CPU 0
E: Current thread: 0x20016318 (unknown)
E: Halting system

SDK: nRF Connect SDK v3.2.1
Toolchain: nRF Connect SDK Toolchain v3.2.1
board: nrf54l15dk/nrf54l15/cpuapp/ns

I added these lines to proj.conf:
CONFIG_BUILD_WITH_TFM=y
CONFIG_TFM_NRF_SYSTEM_OFF_SERVICE=y

but still get the Bus Fault.

The sample at 'ncs\v3.2.1\nrf\samples\nfc'  does work (not /ns)

How can I get this to work for /ns build?

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