Can not create accounts with russian .РФ domain names

Hello, everyone. I am running my server on CWP web panel, and so far it was a pleasant experience to use this software.
But today I found out that I can not add one on my domain names, which is in cyrillic characters to the new account. (It looks like this - XN------7CDIB7BCLBEXCNUJLBERQP0GVED.XN--P1AI )
I already tried to find the solution in Google, but it looks like I'm first person who have a problem like this(

I hope to find some russian developers in this community who was able to resolve the issue. Or able to fix it.
Or at least give me a hint where I can find a solution for this problem.