There is no option for the correct 1st string.
I attach a file so someone can perhaps show me where I’ve gone wrong? Harmonic string numbers.dorico (413.5 KB)
What harmonic are you actually after here? Natural harmonics in Dorico are notated at their sounding pitch, so the high A5 notes in the second bar are the harmonics between the 2nd and 3rd frets on the A string (or between the 3rd and 4th frets on the D string).