Setup chirpastack network server

Hi everyone,
do you know if something is missing in my chirpstack-network-server. toml file showed below?
With 4 gateways registered and some devices, before scaling up, the problem that I have is the downlink that is not wotking at all, with different gateways and devices. Maybe something is missing in the chirpstack network server toml file…

[postgresql]
dsn=“postgres://chirpstack_ns:dbpassword@localhost/chirpstack_ns?sslmode=disable”

[redis]
url=“redis://localhost:6379”

[network_server]
net_id=“000000”

[network_server.band]
name=“EU868”

[network_server.network_settings]

downlink_tx_power=22
disable_adr=false
rx1_delay=3

[[network_server.network_settings.extra_channels]]
frequency=867100000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=867300000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=867500000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=867700000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=867900000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=868.300000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=868500000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=868700000
min_dr=0
max_dr=5

[[network_server.network_settings.extra_channels]]
frequency=868900000 min_dr=0
max_dr=5

[network_server.network_settings.class_b]

ping_slot_dr=0

ping_slot_frequency=0

[network_server.api]

bind=“0.0.0.0:8000”

[network_server.gateway.backend]

type=“mqtt”

[network_server.gateway.backend.mqtt]
event_topic=“gateway/+/event/+”

command_topic_template=“gateway/{{ .GatewayID }}/command/{{ .CommandType }}”

server=“tcp://localhost:1883”

username=""

password=""

[metrics]
timezone=“Local”

[join_server]

[join_server.default]
server=“http://localhost:8003