Modem commands

I've made this following code with inspiration from the at_monitor example to test a custom board using the nrf9160 sip. 

int init()
{
	int err;

	// Initialize the modem
	printk("AT Monitor sample started\n");
	err = nrf_modem_lib_init();
	if (err) {
		printk("Modem library initialization failed, error: %d\n", err);
	}

	// Get modem firmware version
	err = nrf_modem_at_cmd(response, sizeof(response), "AT+CGMR");
	if (err) {
		printk("Failed to read AT+CGMR, err %d\n", err);
	}
	printk("AT+CGMR:\n%s", response);

	// Subscribe to notifications
	printk("Subscribing to notifications\n");
	err = nrf_modem_at_printf("AT+CEREG=1");
	if (err) {
		printk("AT+CEREG failed: %d\n", nrf_modem_at_err_type(err));
	}

	// Get signal quality
	err = nrf_modem_at_printf("AT%%CESQ=1");
	if (err) {
		printk("AT+CESQ failed: %d\n", nrf_modem_at_err_type(err));
	}

	// Set modem in normal mode
	printk("Connecting to network\n");
	err = nrf_modem_at_printf("AT+CFUN=1");
	if (err) {
		printk("AT+CFUN failed\n");
	}

	// Test if modem is in normal mode
	err = nrf_modem_at_printf("AT+CFUN?");
	if (err) {
		printk("AT+CFUN failed\n");
	}

	/* Let's monitor link quality while attempting to register to network */
	printk("Resuming link quality monitor for AT notifications\n");
	at_monitor_resume(&link_quality);

	printk("Waiting for network\n");
	err = k_sem_take(&cereg_sem, K_SECONDS(20));
}

int main(void)
{
	init();
	return 0;
}

I get the following output:

*** Booting Zephyr OS build v3.3.99-ncs1 ***
AT Monitor sample started
AT+CGMR:
mfw-pti_nrf9160_1.1.6
OK
Subscribing to notifications
AT+CEREG failed: 1
AT+CESQ failed: 1
Connecting to network
AT+CFUN failed
AT+CFUN failed
Resuming link quality monitor for AT notifications
Waiting for network

When testing on the nrf9160dk board it seems to work fine:

*** Booting Zephyr OS build v3.3.99-ncs1 ***
AT Monitor sample started
AT+CGMR:
mfw_nrf9160_1.3.5
OK
Subscribing to notifications
Connecting to network
Resuming link quality monitor for AT notifications
Waiting for network
Link quality: -112 dBm
Network registration status: searching
Link quality: -109 dBm
Link quality: -117 dBm
Link quality: -116 dBm
Link quality: -117 dBm
Link quality: -116 dBm
Link quality: -118 dBm
Network registration status: roaming
Link quality: -111 dBm

What do the error codes mean?

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