The issue here is, that even if you system is capable of UEFI Booting, your Windows installation is still installed in legacy mode without a ESP partition.
During the installation, the installer detects that your System is UEFI capable and assumes that Windows is also installed in UEFI Boot Mode - which is normally the case when you install it manually under such conditions. For reasons unknown to me, some devices which come preinstalled with Windows don’t follow this Microsoft Guideline and use legacy boot mode. On these devices, the installation fails:
17:47:11 - D:\a\rufus\rufus\endless\src\endless\EndlessUsbToolDlg.cpp:6276 Unexpected partition type. Partition style is not GPT (GLE=)
17:47:11 - D:\a\rufus\rufus\endless\src\endless\EndlessUsbToolDlg.cpp:5732 Error on MountESPFromDrive (GLE=)
17:47:11 - D:\a\rufus\rufus\endless\src\endless\EndlessUsbToolDlg.cpp:5515 Error on SetupEndlessEFI (GLE=)
So currently, you are unfortunately out of luck setting up a dual boot environment without reinstalling Windows in UEFI boot mode first.