I've tried reading the "Secure Connect" overview and quick start guides - and I'm confused about the whole thing.
SecureConnect to me is the process of authenticating Meraki APs to Meraki switches using only the Meraki cloud.
https://documentation.meraki.com/MS/Access_Control/SecureConnect
This talks about the concept as though there are two licences, essentials and advantage. It talks about AnyConnect and SAML authentication, but AnyConnect licencing is a completely separate thing from Meraki. The quick start guide doesn't talk about how to do anything. It's not a quick start guide at all. If I printed it out and gave it to someone to set up, they couldn't achieve anything.