I already posted my question in the CPanel forums, but did not get any reply. Maybe, somebody here at WHT knows more about this?
I tried to park an IDN domain (including an umlaut = "a" with two dots above) on top of an existing account in WHM 9.1.0.
At first, I converted the domain name to PUNYCODE using the IDN conversion tool and also installed the i-Nav plugin for IE , but the domain cannot be displayed. Also checked with Firefox which does not need any plugin.
I then tried to park the RACE, but this also does not work.
If I just try to park the original domain name without conversion, the special characters are just being deleted by WHM / CPanel.
Has anybody actually got IDN domain names working with WHM / CPanel?