FortiFirewall-VM64-KVM 7.6.7 Permanent Evaluation License / Setup Wizard White Screen on Proxmox

Hello,

I am trying to deploy the FortiFirewall-VM64-KVM v7.6.7 (build 3704) permanent evaluation on Proxmox VE (KVM).

After the initial boot, the GUI always redirects to:

/prompt/fortigate-setup?viewOnly=1&startup=1

but the page remains completely white and the setup wizard never loads.

The CLI shows:

License Status: Invalid

Running:

exec vm-license

returns:

This VM is using the evaluation license.
Failed to download VM license.

Output of:

diagnose hardware sysinfo vm full

shows:

valid: 0
status: 3
code: 0

Things I have already tried:

• Deployed multiple fresh VMs.

• Factory reset.

• Tested with multiple browsers.

• Verified Internet connectivity and DNS.

• Successfully pinged update.fortiguard.net and support.fortinet.com.

• Followed the suggestions from this Community post:
  https://community.fortinet.com/support-forum-92/issue-installing-a-vm-fortigate-223043?postid=223128#post223128

The behavior remains exactly the same.

I also found posts mentioning activation via TFTP using a .lic file, but since I am using the permanent evaluation license, I do not have a license file to upload.

Has anyone experienced the same issue with FortiFirewall-VM64-KVM 7.6.7 on Proxmox, or is there another way to initialize the permanent evaluation license?

My goal is simply to use the permanent evaluation as a lab for testing and studying for the FortiManager Administrator exam.