On Meraki, Bonjour forwarding that helps wireless clients discover wired or other VLAN services is configured on the SSID Wireless › Access control, not inside a Group Policy. A Group Policy can shape/filter traffic, but the Bonjour proxying that makes cross‑VLAN discovery work is an SSID feature on MR, or a Bonjour forwarding rule on MX when the MX is your L3 gateway. If you only set “Bonjour gateway” inside the policy, the iOS app typically still won’t discover the service. Bonjour Forwarding - Cisco Meraki Documentation
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