We have received reports of iOS devices running the Cisco Security Connector receiving incorrect policies assigned after upgrading to iOS 16. Therefore block pages are not showing up.
We are investigating the issue and will release an updated Cisco Security Connector if necessary.
On the iOS device, make sure that the Umbrella resolvers are not listed. This might require changing your router settings if you are using automatic DNS. The Cisco Security Connector will still send traffic to the Umbrella resolvers if they are removed from this list.