@Rig@chipdewolfe Seems like you both use the same version of FOG, so same iPXE version. So what I can think of making the difference is the firmware version. Have you all updated to the very latest firmware?
I’m curious, what drives are inside your HP 840 G6s? We currently have the same laptop at my company, but our drives included in our G6 are Western Digital PC SN520 NVMe SSD. I know there is a configuration with OPAL drives (so they are already encrypted by default)