Hi , I don't have any Z3 to this , but is it affecting ALL your Z3s ? If not , can you take a packet capture and see if the DNS requests sourced by the Z3 are received a valid response ? If you are sure that everything is fine , I would suggest you to open a case with Meraki so that they can log this issue. https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Alerts_and_Notifications/Common_Dashboard_Alerts_for_Device_Connectivity#:~:text=DNS%20is%20Misconfigured,-As%20with%20almost&text=If%20there%20are%20no%20firewall,resolver%20on%20the%20DHCP%20server. Section : DNS is Misconfigured
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