@DBurd49ers
I modified the sketch I posted. I added Bluefruit.begin() and switched
NRF_POWER->SYSTEMOFF=1; to sd_power_system_off(); I also went back to the default arduino implementation for gpio interrupts.
I measure 15uA when the loop is running (system on sleep mode) and 1uA for system off. If your test code doesn’t use the gpio interrupts, then you should see 3uA while the loop is running.
You don’t need the call sd_power_mode_set(NRF_POWER_MODE_LOWPWR) that is for the system on sleep mode and is the default in any case.
I tried DCDC_ENABLE in combination with many other things previously. I may need to test that again now that I have a good baseline. It was the default in Zephyr RTOS, that may be the case here as well.