Cookie
myitcgroup
They both point to the same IP address so, you can use either of them.
myitcgroup
Sorry, I don't get what's the problem. Might be because you have multiple nameservers associated with the domain? Try removing all and add these and try again.
ns1.byet.org
ns2.byet.org
ns3.byet.org
ns4.byet.org
Looks like they are not properly configured as well. https://dnschecker.org/#NS/xn--laviandefume-leb.com