With Catalyst Centre (DNAC) the WLC needs to be managed via intent to be able to do this, it cant be just in assurance mode.
Design>Network Settings>Wireless>Pre-Auth Access Control Lists
Is where you configure WebAuth ACLs
any other ACLs need to be done via CLI template
*****Help out other by using the rating system and marking answered questions as "Answered"*****
*** Please rate helpful posts ***