What router are you using? Have you verified the router is setup for and properly update/configured for the use of IPv6? I am using a Netgear RAXE300
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Killer E3100G 2.5 Gigabit Ethernet Controller
Physical Address. . . . . . . . . : XX-XX-XX-XX-XX
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2600:8805:2700:39:362b:Blanked out-(Preferred)
Temporary IPv6 Address. . . . . . : 2600:8805:2700:39:Blanked out-(Preferred)
Link-local IPv6 Address . . . . . : fe80::c654:Blanked out-(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.xxx.xxxx(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, January 22, 2025 1:50:28 PM
Lease Expires . . . . . . . . . . : Friday, January 24, 2025 1:50:28 PM
Default Gateway . . . . . . . . . : fe80::3698:b5ff:Blanked out-
192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 214734565
DHCPv6 Client DUID. . . . . . . . : Blanked out-
DNS Servers . . . . . . . . . . . : 2600:8805:2700:Blanked out-
192.168.1.1
Can you post your IPv6 WAN settings as seen at ADVANCED > Advanced Setup > IPv6 as seen here. Edited for privacy of-course.
However, I think OP is using prosumer/enterprise grade hardware, which require extra configuration. I asked what OP was using but they seemed to avoid the question, which I assume has something to do with they are IT of some kind and doesn't want say what hardware the customer is using.
