BPI-WIFI6 issue with wifi "802.11r Fast Transition" (WLAN roaming)

Banana Pi Router design
1

After setting up the BPI-Wifi6 as a dumb AP on my local network as discussed here, all my ethernet ports are now working fine.

However I am having issues with wifi when using WLAN roaming 802.11r Fast Transition to integrate with the rest of my local network.

If the 802.11r Fast Transition is not ticked, I can connect to the wifi and everything works without any issues (for the test to run properly, all other wifi were disabled).

However, as soon as I set the “802.11r Fast Transition” and of course set the Mobility Domain with the same 4 digit hexadecimal value as my other Openwrt devices (the 2 other devices are OpenWrt One running on latest version) I cannot even connect to the wifi anymore. I am been asked for password without success (on the laptop) or just fails (on the Android phone).

Is anybody aware of an issue with 802.11r Fast Transition on older OpenWrt versions? The BPI WIFI6 is running version:

Powered by LuCI (240105.15618) / TGP 3.1.0 r19685-512e76967f

as my OpenWRT One’s are using current:

[LuCI Master (25.123.45854~98f7f2a) / [ OpenWrt SNAPSHOT (r29064-696ad7b1aa)](https://openwrt.org/)

My configuration is as shown below:

ksnip_20250525-165952
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ksnip_20250525-170039
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ksnip_20250525-170126890×763 68.6 KB

With the console config:

/etc/config/network

config interface 'loopback'
        option device 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option curmode 'router'

config interface 'lan'
        option proto 'dhcp'
        option device 'br-lan.76'

config device
        option type 'bridge'
        option name 'br-lan'
        option mtu '1500'
        option txqueuelen '1000'
        option mtu6 '1500'
        option macaddr 'D4:77:2B:55:55:56'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'
        list ports 'lan4'
        list ports 'wan'

config bridge-vlan
        option device 'br-lan'
        option vlan '76'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'
config interface 'loopback'
        option device 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option curmode 'router'

config interface 'lan'
        option proto 'dhcp'
        option device 'br-lan.76'

config device
        option type 'bridge'
        option name 'br-lan'
        option mtu '1500'
        option txqueuelen '1000'
        option mtu6 '1500'
        option macaddr 'D4:77:2B:55:55:56'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'
        list ports 'lan4'
        list ports 'wan'

config bridge-vlan
        option device 'br-lan'
        option vlan '76'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'
        list ports 'lan4'
        list ports 'wan'

/etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option path 'platform/wmac.1'
        option band '2g'
        option htmode 'HE20'
        option cell_density '0'
        option country 'CN'
        option channel '8'

config wifi-device 'radio1'
        option type 'mac80211'
        option path 'platform/wmac.2'
        option band '5g'
        option country 'CN'
        option cell_density '0'
        option htmode 'HE40'
        option channel '153'

config wifi-iface 'wifinet5'
        option device 'radio0'
        option mode 'ap'
        option encryption 'psk2'
        option key 'password'
        option ieee80211r '1'
        option ft_over_ds '0'
        option ft_psk_generate_local '1'
        option ssid 'AB'
        option network 'lan'
        option mobility_domain '8d5a'

config wifi-iface 'wifinet1'
        option device 'radio1'
        option mode 'ap'
        option encryption 'psk2'
        option key 'password'
        option ieee80211r '1'
        option ft_over_ds '0'
        option ft_psk_generate_local '1'
        option ssid 'AB'
        option network 'lan'
        option mobility_domain '8d5a'

Any idea on what may be wrong in my config?