Yep.
RADIUS Accounting with a Sign-On Splash Page
RADIUS accounting can be used with RADIUS authenticated splash pages to provide information regarding when a client was authorized through the splash page and later had that authorization cleared/expired. These messages are sent from the dashboard to the customer's configured RADIUS server.
Note: RADIUS accounting is only available by default with 802.1X authentication. To enable RADIUS accounting for splash pages as well, please contact Cisco Meraki support. RADIUS accounting is not currently available on splash pages for security appliances or teleworker gateways.
I am not a Cisco employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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