Creating a Windows installer USB disk from Fedora :
install "Woe-USB". You can't do without it. No other method works.
sudo dnf install Woe-USB -y
Download the Windows 10 ISO for free from MS site. Doesn't matter if you want home or enterprise edition. It's the same installer.
Now write the ISO to the USB disk
sudo woeusb --target-filesystem NTFS --device Win10_20H2_English_x64.iso /dev/sdc
Where sdc is your USB mounted device.
To figure out where you USB device is mounted run lsblk.
Will take about half an hour for the write to finish. The ISO is 6 GB. You will need a 8 GB drive minimum.
And as for license key.
You don't need a License Key. Windows installer will read your license from your laptop's BIOS and activate properly without asking you to enter anything.