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IPv6 address at PC not assigned by DHCP server

hi Support

Im quite new in networking. recently, i have been given a case on ipv6 issue for our client. the ipv6 configuration has been setup at  a few related vlan's interface. The issue is, the host device[desktop PC] able to get the ipv6 address as well as ipv6 default gateway, but when check at dhcp server, the ipv6 address for the PC not available - meaning that the address is not assigned by the DHCP server.

below is the sample config at 1 of the vlan interface for ipv6 configuration in the coreswitches for your perusal

=====================================================================

interface Vlan201

 ip address 192.168.201.2 255.255.255.0

 ip helper-address 192.168.13.101

 standby version 2

 standby 16 ip 192.168.201.1

 standby 16 priority 101

 standby 16 preempt

 standby 49 ipv6 2401:5200:8888:8A01:192:168:201:1/64

 standby 49 priority 101

 standby 49 preempt

 ipv6 address 2401:5200:8888:8A01:192:168:201:2/64

 ipv6 enable

 ipv6 dhcp relay destination 2401:5200:8888:8013:A2B5:7A08:C429:994A

 ipv6 dhcp relay destination 2401:5200:8888:8013:1090:D13:9040:44FB

 ipv6 dhcp relay destination 2401:5200:8888:8013:5658:1A83:1753:823D

 ipv6 dhcp relay destination 2401:5200:8888:8013:192:168:13:101

 ipv6 dhcp relay destination 2401:5200:8888:8013:192:168:13:18

 ipv6 dhcp relay destination 2401:5200:8888:8013:192:168:13:19

======================================================================

below is the ipv6 config for related access switch:

================================================

Switch#sh run int vlan 200

Building configuration...

 

Current configuration : 129 bytes

!

interface Vlan200

 ip address 192.168.200.2 255.255.255.0

 ipv6 address 2401:5200:8888:8A00:192:168:200:2/64

 ipv6 enable

end

 

Switch#sh run int vlan 201

Building configuration...

 

Current configuration : 129 bytes

!

interface Vlan201

 ip address 192.168.201.2 255.255.255.0

 ipv6 address 2401:5200:8888:8A01:192:168:201:2/64

 ipv6 enable

end

 

Switch#sh run int fa0/47

Building configuration...

 

Current configuration : 86 bytes

!

interface FastEthernet0/47

 switchport access vlan 200

 spanning-tree portfast

end

 

Switch#

=================================================================

In the attachment, sample ping result from the desktop PC. 

Im not sure what to check further on this. Have checked  related documentation on ipv6 relay destination, the config is same. Can you help me on this? Thank you very much for your kind assistance. 

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