MSM760- egress to a vlan and get the ip-address from it

[Steelena]

I have a MSM760-controller on a vlan with AP:s (MSM422). The APs are untagged on the vlan and tagged on a other vlan. The LAN-port of the controller is connected to the same vlan. The controller and the APs get their ip-addresses from an other DHCP-server (not the controller) through dhcp relay function.
The internet port is connected to our local network.
I want to egress to the other vlan (the tagged) if the user succeeds to authenticate. I get that to work, but not to egress to the other vlan, so it would get an ip-address from the vlan it egress to. It keeps the ip-address from the untagged vlan. (If I skip the authentication and egress straight from the AP it gets an ip-address from the egressed vlan.) Is it even possible? Am I missing something with the routing? I’m greateful for all help :-) !