Punycode converter for IDN domains in Cpanel so that it add xn-- and in browser show correct domain but in cpanel you replace German word of domain.
Use https://www.punycoder.com/ so that it will convert the word and then into cpanel you create account by adding xn-- . it open correctly into your browser without any problem. Mostly support support international domain names . cpanel development team still working on it to solve the problem.
PDTR or Reseller Club not support it about register the domain with German Characters.
DE IDN: Restricted German characters, English alphabets and digits
Note the character ß (codepoint=223) is not supported on our platform.
.ES IDN: Restricted Spanish characters, English alphabets and digits