Wifi not seen between Archer C6 and Dahua Wifi Camera

Hi guys,
i've bought two tp-link Archer C6 wifi router because i've seen they're fully supported by openwrt.
So i've installed openwrt 19.07 on both, and i've setup my wireless network on one of both.
I've placed the first router 3 meters away from my wifi cam, inside my house,
The camera is a dahua XS-IPCV026H-2EW, that is already connected to my old wifi, that has poor quality.
I've logged in my camera settings, to discover the new wifi network provided by my openwrt router, but surprise, there is no network!
My mobile phone connects flawlessly to the new network provided by archer c6, but the camera can't see it, it shows all SSID but not the one provided by openwrt.
I know for sure dahua only support 2.4 ghz network.
Someone can help me solve this issue?
Thanks
fabriizo

This is my wifi config

root@shak_wifi_p0:~# uci show wireless
wireless.radio0=wifi-device
wireless.radio0.type='mac80211'
wireless.radio0.channel='36'
wireless.radio0.hwmode='11a'
wireless.radio0.path='pci0000:00/0000:00:00.0'
wireless.radio0.country='IT'
wireless.radio0.htmode='HT20'
wireless.default_radio0=wifi-iface
wireless.default_radio0.device='radio0'
wireless.default_radio0.mode='ap'
wireless.default_radio0.encryption='psk2'
wireless.default_radio0.key='XXXXXX'
wireless.default_radio0.ssid='shak_wifi_p0_5Ghz'
wireless.default_radio0.network='lan'
wireless.radio1=wifi-device
wireless.radio1.type='mac80211'
wireless.radio1.hwmode='11g'
wireless.radio1.path='platform/ahb/ahb:apb/18100000.wmac'
wireless.radio1.channel='2'
wireless.radio1.country='IT'
wireless.radio1.htmode='HT20'
wireless.wifinet1=wifi-iface
wireless.wifinet1.device='radio1'
wireless.wifinet1.network='lan'
wireless.wifinet1.key='XXXXX'
wireless.wifinet1.ssid='wifiShak'
wireless.wifinet1.disassoc_low_ack='0'
wireless.wifinet1.encryption='psk2'
wireless.wifinet1.mode='ap'
wireless.wifinet1.wds='1'
root@shak_wifi_p0:~#