FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Article Id 249548
Description This article describes that is it not possible to generate reports other than 360-degree activity reports on Forticloud.
Scope FortiGate.
Solution FortiCloud summary report has been ceased for the free version of FortiCloud starting 22.3.0 which was released on September 9, 2022.

To continue with the summary report, customers must have an active FortiCloud service subscription.

After September 8th, there will be no newly generated Summary reports, only 360-degree activity report is available without a paid subscription.

Reference link for FortiGate_Cloud-22.3-Administration_Guide: