I hope you configured Syslog with the right configuration as described in Scenario 3 - Reachable via AutoVPN https://documentation.meraki.com/General_Administration/Monitoring_and_Reporting/Syslog_Server_Overview_and_Configuration Check this article as well, if you are inline with the configurations https://snehpatel.com/index.php/2019/09/11/configuring-syslog-in-meraki-device/
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