Dahua NVR activate NetAlarm using HTTP API

[titanium_akt]

I'm trying to activate a net alarm on Dahua NVR-608-32-4KS2 (V4.002.0000000.2.R, Build Date: 2023-02-20)
Using latest HTTP API guide I could find: DAHUA_HTTP_API_3.37

I sent this:

https://10.0.0.200/cgi-bin/netAlarm.cgi?action=setState&channel=1&alarm=true

then entered my Username and Password but got this response in return:
Error
Bad Request!

And response to this:

https://10.0.0.200/cgi-bin/configManager.cgi?action=getConfig&name=NetAlarm

is:
table.NetAlarm[0].Enable=true
table.NetAlarm[0].EventHandler.AlarmOutChannels[0]=0
table.NetAlarm[0].EventHandler.AlarmOutEnable=false
table.NetAlarm[0].EventHandler.AlarmOutLatch=10
table.NetAlarm[0].EventHandler.BeepEnable=true
table.NetAlarm[0].EventHandler.Dejitter=5
table.NetAlarm[0].EventHandler.Delay=0
table.NetAlarm[0].EventHandler.LogEnable=true
table.NetAlarm[0].EventHandler.MMSEnable=false
table.NetAlarm[0].EventHandler.MailEnable=false
table.NetAlarm[0].EventHandler.MessageEnable=false
table.NetAlarm[0].EventHandler.MessageToNetEnable=true
table.NetAlarm[0].EventHandler.MonitorTour[0].Channels[0]=0
table.NetAlarm[0].EventHandler.MonitorTour[0].Enable=false
table.NetAlarm[0].EventHandler.MonitorTour[0].Split=Split1
table.NetAlarm[0].EventHandler.MonitorTour[1].Channels[0]=0
table.NetAlarm[0].EventHandler.MonitorTour[1].Enable=false
table.NetAlarm[0].EventHandler.MonitorTour[1].Split=Split1
table.NetAlarm[0].EventHandler.PtzLinkEnable=false
table.NetAlarm[0].EventHandler.RecordChannels[0]=0
table.NetAlarm[0].EventHandler.RecordEnable=false
table.NetAlarm[0].EventHandler.RecordLatch=10
table.NetAlarm[0].EventHandler.SnapshotChannels[0]=0
table.NetAlarm[0].EventHandler.SnapshotEnable=false
table.NetAlarm[0].EventHandler.SnapshotPeriod=1
table.NetAlarm[0].EventHandler.SnapshotTimes=5
table.NetAlarm[0].EventHandler.TimeSection[0][0]=1 00:00:00-24:00:00
table.NetAlarm[0].EventHandler.TimeSection[0][1]=0 00:00:00-24:00:00
table.NetAlarm[0].EventHandler.TimeSection[0][2]=0 00:00:00-24:00:00
table.NetAlarm[0].EventHandler.TimeSection[0][3]=0 00:00:00-24:00:00
table.NetAlarm[0].EventHandler.TimeSection[0][4]=0 00:00:00-24:00:00
...

Am I doing anything wrong?
Is it possible that this API manual is not compatible with my firmware version?
Has anyone got new version of HTTP API manual?