Question about vlan and firewall policy

I'm starting my studies on the Fortigate Firewall and I'm trying to create two small networks by myself in PNET Lab. The topology consists of a Fortigate and 2 Cisco Switches. The objective is to create the VLANs, a for each port on the Fortigate, deliver IP to two PCs one on each switch and the VLANs must communicate. I've already created the VLANs, the DCHP server on them, trunk mode on the switches, but I can't receive IP via DCHP. I did a test on another port with another PC without the switch and it worked normally, but I need it to work with the switches. I decided to ask for help, as I've been looking for a solution on my own for 2 days and haven't found one