Hello Julius,
You can define a WLAN with a WPA2-PSK that is shared, with additional Web
Authentication thru an AD authentication server. Define the AD server first, under
Configure AAA Servers. Then from Configure WLANs, create new, with Standard
type, WPA2/AES encryption/algorithm options, check the box for Web Authentication
and choose your AD server from the drop-down list. I hope this is helpful.