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Hardware Version :

Firmware Version :

ISP :

Here's my configuration:

I have three VLANs on my network:

10 - Management
20 - LAN
40 - Guest WiFi

The switchport that my access point is plugged in to is configured with VLAN 10 untagged (native), VLANs 20 and 40 tagged.

My TL-WA901ND access point has its management IP address set correctly for access from VLAN 10, and that's working.
It has two SSIDs configured, one assigned VLAN 20 and the other assigned VLAN 40.

Here's the problem:

When I connect a device to the access point, it connects properly and gets an IPv4 address from the DHCP server on the correct VLAN. However, it gets an IPv6 address via NDP/RA from the management VLAN instead, which breaks my network.

Is there something wrong with my configuration, or have I found a bug in the WA901ND firmware?