The DHCP scope for guest onboarding must use the default gateway of the guest VLAN. In the diagram, the guest network is associated with the interface labeled 10.20.1.250, which serves as the gateway for that subnet.

The integration between FortiNAC-F and Mobile Device Management (MDM) platforms (such as Microsoft Intune, VMware Workspace ONE, or Jamf) is a critical component for providing visibility into mobile assets that do not connect directly to the managed infrastructure via standard wired or wireless protocols.
According to the FortiNAC-F MDM Integration Guide, the communication between the FortiNAC-F appliance and the MDM server is handled through REST API calls. FortiNAC-F acts as an API client, periodically polling the MDM server to retrieve device metadata, compliance status, and ownership information. If communication is failing, it is most likely because the API credentials (Client ID/Secret) are incorrect, the MDM's API endpoint is unreachable from the FortiNAC-F service port, or the SSL certificate presented by the MDM is not trusted by the FortiNAC-F root store.

The Guest-VLAN value is defined within the switch Model configuration, where VLAN mappings and enforcement actions are configured. The network access policy references this configuration to apply the appropriate VLAN when the policy conditions are met.