Default VLAN Dot1x Radius

[S4mrai]

Hello, 

we run a bunch of 7450 and 7250 in Switching mode and Setup a NPS ( Windows Radius ) with eap-tls cert auth like this:

authentication
 auth-mode multiple-untagged
 auth-default-vlan 160
 restricted-vlan 1002
 re-authentication
 auth-fail-action restricted-vlan
 dot1x enable
 dot1x enable ethe 1/1/39
 dot1x port-control auto ethe 1/1/39

radius-server host rad.ip.add.ress auth-port 1812 acct-port 1813 default key 2 mysecretkey dot1x

If I try to connect clients to our default VLAN ( Radius returns U:Default-VLAN ) I get the following error message:   Parse error as VLAN-ID XXX is used as sys-def-vlan

Can I not use my Default VLAN for dot1x radius auth ? If so is there a way on ICX to move all ports from one VLAN to another ?