Imported Ubuntu server cloud image fails to boot

This problem has been haunting me without being able to find a solution.

I simply grab the cloud image for 24.04, import it into proxmox and create a template with bios - q35 - virtio SCSI controller and attach the disk on scsi0

But at first boot it goes into initramfs saying it cannot find the /root

Which from a blkid indeed it shows only the mbr.

Again, I'm not making any changes to the imported img file just trying to have a template.

If I'm analysing the img it doesn't show a partition table which is weird, and it's not a corrupted download because I checked the md5

My storage is lvmthin but from my research it doesn't say that it can be the culprit.

What is more confusing is that I found guides that outline the same process but I'm out of ideas at this point. BTW this is latest proxmox 9

Thanks all for any suggestions!