Maybe you asked wrong email addy, or said wrong things? @EuroTy can you advise him on best way to contact HP and get a SMC.bin in this situation, thanks!
Meantime, I will make you a AMT enabled BIOS, maybe that alone will work, if not we can change BIOS settings probably to enable if ME change alone does not get it. You did already try to enter MEBx via Control + P?
Edit @ZBooker - AMT is already enabled at ME level, so BIOS setting is all that’s holding it back. Can you enter MEBx, or enable AMT/MEBx from a visible BIOS setting, maybe in management?