Is pm_notifier available on nRF 52-series (and if so, how do I get it to work)

Hi,

I'm wanting to use pm_notifier to potentially execute actions on entry/exit from sleep states.

I have these two functions defined:

void power_state_entry_tasks(enum pm_state state)
{
    printk("Entering power state %d", state);
}
void power_state_exit_tasks(enum pm_state state)
{
    printk("Woke up from power state %d", state);
}
And I have, essentially, the notifier object defined in my context object:
typedef struct
{
    struct pm_notifier pm_notifier;
} my_context_t;
my_context_t my_context =
{
    .pm_notifier =
    {
        .state_entry = power_state_entry_tasks,
        .state_exit = power_state_exit_tasks,
    }
};
And then, my main() function:
void main(void)
{
    pm_notifier_register(&(my_context.pm_notifier));
    while (1)
    {
        LOG_INF("hello");
        k_sleep(K_MSEC(1000));
    }
}
I see "hello" in the console every second, but I don't see any messages from my sleep entry/exit functions.
What am I missing?
Thanks!
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