booting windows from external ssd

hi i have just switched laptop i was previously able to boot windows 10 from my eexternal SSD that is created on windows using winTOusb on windows. i was running debian on my main internal system.

i am no longer able to boot it on my new thinkpad. or my old laptop. , does secure booot need to be off ?

just wondering if there is a way to install windows completely on a external ssd using linux or do i need access to a windows computer.

any help would be great thanks