After your virtual access points are configured and added to a VAP group, that group must be applied to the internal wireless radio and made available to the users.
To make the group available:
Navigate to the DEVICE | Internal Wireless > Virtual Access Point page.
In the Virtual Access Point Groups screen, click the triangle icon to expand the Internal AP Group or other group which you want to enable.
Click Edit icon in the row for the VAP and select Enable Virtual Access Point in the Edit dialog.