Create Virtual Server with ü charector issue

When I had Create Virtual Server with my domain name then its creating like below,

Domain name : (real Domian Name with ü charector)

Real DNS domain name : xËxÓ

(DNS entry add as xËxÓ )

I want create DNS with my registered domain name.
Issue find about ü charector in domain registered name. but its need to configure that domain in virtualmin.

So how can i create its and resolved this issue, kindly helping out to me on the same.