Unable to add domain. This Operation has been restricted.

Unable to add domain. This Operation has been restricted.

Hello,

I Just try to add domain to my account. we are unable add and get error "This Operation has been restricted. Please contact support. - ...."

My account is under 

praanavclothingmills@yahoo.in
+91 98431 38822


and required domain name to be add
praanavclothing.in


Thanks in advance