--Edited with additional information -- Yes, with an MX device, you can set an alert for this under Network Wide -> Configure -> Alerts Then check the box for "Clients connect or disconnect from the LAN" and select the client to track. Another solution to achieve this would be either to use the API to poll clients, or to use a syslog server to receive syslogs and send automated alerts on client connection/disconnections. This previous thread is quite similar: https://community.meraki.com/t5/Developers-APIs/Alerting-a-client-association-to-network-Webhooks/m-p/100212#M4048
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