Laptops get IPv6 on the new Wi-Fi VLAN but Android phones do not

IPv6 was rolled out on the corporate Wi-Fi, VLAN 40, last week. The security team asked for stateful DHCPv6 so that every address would appear in a lease log. Windows and macOS laptops get 2001:db8:acad:40::/64 addresses and work over IPv6. Android phones on the same SSID show only an fe80:: address and use IPv4 for everything. The gateway is an SVI on DSW1, which relays DHCPv6 to the server at 2001:db8:acad:100::10.