To clarify, when an SSID is configured with Sign-On Splash page enabled, the two settings that must be configured for unauthenticated clients to have full network access and not be allow listed are:
* Controller disconnection behavior: This setting determines how the clients are treated when the Meraki cloud controller is unreachable. The options are Restricted or Unrestricted. The former option blocks all traffic from unauthenticated clients until the controller is reachable again. The latter option allows unauthenticated clients to access the network without signing on until the controller is reachable again 1
.
* Captive Portal strength: This setting determines how often the clients are redirected to the splash page for authentication. The options are Block all access until sign-on is complete or Allow non-HTTP traffic prior to sign-on. The latter option allows unauthenticated clients to access other protocols such as DNS, DHCP, ICMP, etc., but blocks HTTP and HTTPS traffic until they sign on. This option is recommended for compatibility with devices that do not support web-based authentication 1 .
Reference: https://documentation.meraki.com/MR/Access_Control

Explanation
iOS devices that are using Apple's Device Enrollment Program (DEP) can be supervised and enrolled over-the-air anytime they are factory reset. DEP is the best way to permanently force your devices to be owned and managed by your organization, and it is important to assign your DEP settings properly before deployment.
https://documentation.meraki.com/SM/Device_Enrollment/Enrolling_and_Supervising_iOS_Devices_using_App

Explanation:
The settings that will be cloned using the Cisco Meraki MS switch cloning feature are:
* port name
* interface type
* STP bridge property
The settings that will not be cloned using the Cisco Meraki MS switch cloning feature are:
* switch management IP
* switch name

Explanation
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https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Creating_and_Applying_Gr