False positive AV in URL/Website

[mmehl]

Fortigate is blocking the website https://shop.meyco.eu/main/ :

High Security Alert

You are not permitted to download the file "" because it is infected with the virus "HTML/RedirBA.INF!tr".
URL https://shop.meyco.eu/main/
Quarantined File Name [disabled]
Reference URL https://fortiguard.com/encyclopedia/virus/8065247

Virustotal shows an clean state incl. Fortinet.
https://www.virustotal.com/gui/url/c798a22c5ab03d8c93c17795c08ca850cbdde956313717a9efcb4a417d89d05a

I have already tried to clear the web cache and reboot the Fortigate like it is describte in this technical tip:
https://community.fortinet.com/t5/FortiGate/Technical-Tip-Scenario-on-FortiGate-Antivirus-false-posi...

But it doesn't help. What can we do else?
Thanks in advance

[mmehl]

But where can i add an exception?