sorry have forgotten what means:
Bei Passwort und Login benützen Sie die Zeichen ohne Diakritik und ohne Lücken.
at password take words without!!! Diakritik = (as example)>>> Zedilla ç, Hatschek (Häkchen/Caron) ลก und Tilde ñ
and so on. also take no gap like as example "rodeo rider"
correct would be "rodeorider"
my english is not perfect, hope all is to understand. ;-)