No client connections with a hidden network (SSID)

Hello!
I use some routers with wi-fi and when I do network hidden (hide-ssid) for mode “2ghz-onlyn” , no one client can not connect over the air. If a different value “band=2ghz-b/g/n” at a hidden network, the clients are connected and working.
Here is an example of the configuration for my RB2011UiAS-2HnD:

interface wireless export 
# jan/20/2015 09:38:17 by RouterOS 6.25
# software id = BF83-J70C
#
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n default-forwarding=no \
    disabled=no frequency=2472 frequency-mode=superchannel hide-ssid=yes \
    l2mtu=1600 mode=ap-bridge multicast-helper=full radio-name=RB2011 ssid=\
    xxxxx tx-power=20 tx-power-mode=all-rates-fixed wireless-protocol=802.11 \
    wmm-support=enabled
/interface wireless nstreme
set wlan1 enable-polling=no
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" \
    group-key-update=30m mode=dynamic-keys supplicant-identity=MikroTik \
    wpa2-pre-shared-key=xxxxxxxxx

Why i can’t use hidden network in 2Ghz-only-N mode?