IPV6 DHCP : Active Clients always zero 0

Hello All,
I have configure IPV6 DHCP by using below mentioned configuration, all my LAN PCs are getting IPV6 correctly and internet is also running well.
But if run this command on Router, so it shows Active Clients are always zero 0.
R1# sh ipv6 dhcp pool
DHCPv6 pool: DHCP_POOL
DNS server: 2001:470:ab::cd
Domain name: abc.com
Active clients: 0
R1# sh ipv6 dhcp binding --> also show empty result.
Can anyone please tell me the reason .
MY CONFIGURATION:
ipv6 unicast-routing
ipv6 dhcp pool DHCP_POOL
dns-server 2001:470:ab::cd
domain-name abc.com
interface FastEthernet0/0
no ip address
speed 100
full-duplex
ipv6 address 2400:FC00:ab::/64 eui-64
ipv6 nd prefix 2400:FC00:ab::/64
ipv6 nd other-config-flag
ipv6 dhcp server DHCP_POOL
ipv6 route ::/0 2400:FC00:ab::1
int fa0/0 is directly connected to my LAN Switch.
Regards,

Ok , the problem solved by changing the configuration in this way. Now it is showing Active clients and Bindings.
I will try your method too, to just add ipv6 nd managed-config-flag in my previous config.
But i am still confused which configuratrion is better and which technique to use ??
My previous config was stateless , is my new config is stateful ??
My NEW Configuration:
ipv6 unicast-routing
ipv6 cef
ipv6 dhcp pool DHCP_POOL
address prefix 2400:FC00:ab::/64 lifetime infinite infinite
link-address 2400:FC00:ab::2/64
dns-server 2001:470:ab::cd
domain-name abc.com
interface FastEthernet1/0
no ip address
duplex full
speed 100
ipv6 address 2400:FC00:ab::2/64
ipv6 enable
ipv6 nd managed-config-flag
ipv6 dhcp server DHCP_POOL
ipv6 route ::/0 2400:FC00:ab::1

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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
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Rebecca Tu
TechNet Community Support

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I see LOTS of help and what to do for IPv4, but it's a ghost town for IPv6 DHCP configuration? Hardly anything on youtube etc that shows this simply. Lots of complicated unrelated IPv6 stuff though.
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Hi Yusuf,
You need to do a configure a few things on the router interface for DHCPv6 to be used instead of SLAAC.
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IPV6 DHCP : Active Clients always zero 0

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