Experienced the same problem with the Splash Page showing only for Android devices but not for Apple Devices.   You can try the following: Checking the Firmware version running on the AP's to see if there is any known bugs - possibly try upgrading the access points. Check if there MDM software on the IPhones and not on the Androids. Are you able to run a packet capture when the device try to connect? Maybe check the wireless  health under the wireless - monitor tab to see the number of failed connections and the reason for them. - Might be difficult as the devices are not getting to the splash page to even authenticate. Review any firewall rules which could be preventing connectivity to cisco specific splash page. - If there was a rule blocking it I would expect it to impact both IPhone and Android. We never managed to get a resolution for our issue as we migrated to a PSK instead.   Hopefully the above helps. ... View more