The uppercase of ß, (German Sharp S) is translated as 'SS' which is
incorrect.

The uppercase of ß (capital sharp S) needs to translate to a single character
ß, in order to be compliant with national law. Recently, (June 2017),
official German orthography states that upper S sharp must use a single
character.

See character: u1E9E
http://unicode.org/charts/PDF/U1E00.pdf