Network UPS Tools (nut) setup issues

I’m monitoring the UPS attached to the QNAP NAS with the following networkupstools.cfg:

# Refresh interval for state updates in milliseconds (optional)
refresh=60000

# UPS device name
ups1.device=qnapups

# UPS server hostname (optional)
ups1.host=<QNAP_ip>

# UPS server port (optional)
ups1.port=3493

# UPS server login (optional)
ups1.login=admin

# UPS server pass (optional)
ups1.pass=<password>

ups.items:

Group gUPS "UPS" <ups> (All)
//Number gUPS_Output_Voltage "UPS output voltage [%.1f V]" (gUPS) {networkupstools="ups1:output.voltage"}
Number UPS_Battery_Charge "Battery level [%d %%]" (gUPS) {networkupstools="ups1:battery.charge"}
Number UPS_Battery_Voltage "Battery voltage [%.1f V]" (gUPS) {networkupstools="ups1:battery.voltage"}
Number UPS_Input_Voltage "Input voltage [%d V]" (gUPS) {networkupstools="ups1:input.voltage"}
Number UPS_Input_Voltage_Nominal "Input nominal [%d V]" (gUPS) {networkupstools="ups1:input.voltage.nominal"}
Number UPS_Current_Load "Current load [%d %%]" (gUPS) {networkupstools="ups1:ups.load"}
String UPS_Battery_Runtime "Runtime [JS(duration_from_seconds.js):%s]" <clock> (gUPS) {networkupstools="ups1:battery.runtime"}