Cloudflare can't point to the interface of FortiGate

Hi

I create a virtual IP like this ( public IP → private IP) so the users can access an app in my DMZ. Which is working but after pointing my domain name in Cloudflare to the public IP I get these error messages:

Error 521

ERR_QUIC_PROTOCOL_ERROR

I can’t find any logs were Fortigate deny any traffic to the app’s IP address.

How do I make sure that FortiGate is not blocking Cloudflare IPs ?

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