secure boot violation

Hello all, Seems like the issue I was having where I couldn't install Proxmox with UEFI enabled because I was getting a SHIM error is coming up with the lates 6.8.12-5-pve kernel. Loading Linux 6.8.12-5-pve ... error: bad shim signature. Loading initial ramdisk ... error: you need to load the...

According to docs the secure boot is supported (starting from 8.1). But I am getting secure boot violation error for MSI Cubi N ADL (N200) nettop with factory default secure boot settings. The installation media (USB flash drive) is created using rufus 4.5p (as suggested by the same docs) in DD...