Extra channel for AS923

Hi,

I would like to understand how extra channel works.
I’m using AS923. the netowrk configuration as follows:

[network_server.band]
name=“AS923”

#LoRaWAN network related settings.
[network_server.network_settings]

# Extra channel configuration.
#
# Use this for LoRaWAN regions where it is possible to extend the by default
# available channels with additional channels (e.g. the EU band).
# The first 5 channels will be configured as part of the OTAA join-response
# (using the CFList field).
# The other channels (or channel / data-rate changes) will be (re)configured
# using the NewChannelReq mac-command.
#
[[network_server.network_settings.extra_channels]]
frequency=922100000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=922400000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=922600000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=923000000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=923600000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=921900000
min_dr=6
max_dr=6

[[network_server.network_settings.extra_channels]]
frequency=923850000
min_dr=7
max_dr=7

However, after the device joins, the frequency plan set in the device does not contain frequency 923.4 MHz. Why is it not included? isnt this one of the default AS923 frequencies?