Dear all,
first I’d like to let you know, that this installation is not my first “rodeo” 
, so I do know what to do when installing new or other software on different hardware.
My first try was to install the core version which worked like a charm and it was also recognized by UEFI. Now here comes the catch…
Then I created a Scale boot usb with rufus with MBR and installed it I chose to also install the EFI Option when I was asked about it, but the hardware didn’t recognise the Boot ssd as UEFI but only as Legacy.
When I created the GPT Boot with Rufus and tried to boot it in UEFI - the legacy boot doesn’t work as you get a “rufus error” (that the disk was created for UEFI boot only). The UEFI boot brings me to grub and I don’t have a slightest Idea why.
Rufus config
The hardware DOES support UEFI :-)!
I’m running the “installed SSD” as legacy which is not a problem at all, but I’d still like to try running it as UEFI
Thank you for your help!
Kind regards!
Rok