You might need to run Packet capture using "Wireshark" or some other tools, to find whether the DHCP handshake process is completed or stuck at some point. Below are the four messages exchanged during this process.
1. Discover : Client broadcast to find available DHCP servers.
2. Offer: If the DHCP server is available, then it responds with available address and options.
3. Request: Client requests offered address.
4. Ack: Server acknowledges client's requests for address information.
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.