In a hybrid authentication model with both certificate-based authentication for pre-logon and SAML-based multi-factor authentication (MFA) for user logon, the GlobalProtect agent processes the flow as follows:
During the pre-logon stage, the agent uses the machine certificate to authenticate and establish the initial VPN tunnel.
Once the user logs in (after the machine is connected), the agent then triggers SAML-based MFA to ensure the user is authenticated with multi-factor authentication, validating both the device and the user identity before granting full access.
This method ensures that both the device and user are properly authenticated and validated in the hybrid authentication model.

In a Layer 2 configuration, interfaces are typically grouped into the same Layer 2 zone. When the interfaces are assigned to the same VLAN, the firewall will treat them as part of the same broadcast domain.
In a Layer 2 setup, interfaces must be in the same Layer 2 zone to allow the traffic within the same VLAN to pass. Additionally, a security policy must be configured to allow traffic within this VLAN or zone. This will resolve the issue by ensuring that traffic is permitted between clients behind different interfaces assigned to the same VLAN.