Looks like Anyconnect and its licensing has had a bit of a rebranding.
For Meraki MX with Anyconnect, it's trusted that the customer has purchased Anyconnect licenses. There's no validation performed in the dashboard.
The license required is one of the following types:
- AnyConnect Pluslicense - L-AC-PLS-LIC=
- Apex license L-AC-APX-LIC=
- VPN Only license L-AC-VPNO-
AnyConnect Licensing on the MX Appliance - Cisco Meraki
Based on the type of license you're looking at, you can then purchase them in bands depending on the number of users and length of time.
The following link details all of the available SKU's for each license type.
Products - Cisco Secure Client Ordering Guide - Cisco