Orbi pro (SXK80) behind UDM router | Dynamic Vlan via radius

Dear community, dear Netgear Team,

I set up a UniFi UDM as a router with a radius server. Behind the UDM, I am running a Orbi Pro (SXK80 and a SXS80) on firmware 3.3.0.122 as an AP. The challenge is that I would like to dynamically assign a vlan to Orbi clients based on the radius authentication on the UDM.

For now, the authentication works, but the ips assigned to clients do not match the correct vlan address range, even though the tcpdump on the UDM indicates the right vlan in the accept message. so it seems the Orbi pro just doesn’t “understand” / “convert” / “translate” the radius reply correctly to its clients.

I found some documentation on dynamic vlan for other netgear products but non of it for the Orbi Pro. The configurations mentioned for other products (dynamic vlan, …) are not available in the Orbi pro Settings, so I cannot select anything but the radius ip, port and shared key.

If I select a vlan, only the selected address range is used, even if the radius credentials and the tcpdump would suggest a different address range.

How can I configure the Orbi Pro to dynamically select a vlan?

Thanks