ErwanMAS:

I have multiple SID on radio1 BOAT , BEACH-LOC , BEACH-EXT
2 Regular AP and 1 AP with WDS

The AP with WDS is not in the right vlan

BOAT , BEACH-LOC have right vlan , and BEACH-EXT is NOT in the right VLAN must be in VLAN 4 , same as BEACH-LOC but instead is in VLAN 1

Hardware & OS
Openwrt 21.02rc3 on Linksys 1900ACS

Output of bridge vlan
port vlan-id
lan4 2 PVID Egress Untagged
lan3 2 PVID Egress Untagged
lan2 2 PVID Egress Untagged
lan1 1
2
3
4
br-lan 2
3
4
wlan0 2 PVID Egress Untagged
wlan1 2 PVID Egress Untagged
wlan1-1 4 PVID Egress Untagged
wlan1-2 4 PVID Egress Untagged
wlan1-2.sta1 1 PVID Egress Untagged

extract of /etc/config/network
config interface 'lan'
option proto 'static'
option netmask '255.255.255.0'
option device 'br-lan.2'
option ipaddr '192.168.8.1'
option delegate '0'

config bridge-vlan
option device 'br-lan'
option vlan '4'
list ports 'lan1:t'

config interface 'PRV'
option proto 'static'
option ipaddr '192.168.18.1'
option netmask '255.255.255.0'
option defaultroute '0'
option delegate '0'
option device 'br-lan.4'

extract of /etc/config/wireless

config wifi-iface 'default_radio1'
option device 'radio1'
option network 'lan'
option mode 'ap'
option macaddr '22:ff:aa:bb:22:66'
option key 'zzzzzzzzzzz'
option ssid 'BOAT'
option encryption 'psk2'

config wifi-iface 'wifinet2'
option ssid 'BEACH-LOC'
option encryption 'psk2'
option device 'radio1'
option mode 'ap'
option network 'PRV'
option key 'zzzzzzzzzzz'

config wifi-iface 'wifinet3'
option wds '1'
option ssid 'BEACH-EXT'
option encryption 'psk2'
option device 'radio1'
option mode 'ap'
option network 'PRV'
option key 'ZZZZZZZZZZ'