This Operation has been restricted. [when enabling mailhosting and adding domain]

This Operation has been restricted. [when enabling mailhosting and adding domain]

Hello Admin/Employee

I'm encountering a problem here when i'm adding my domain

my e-mail addressed i'm using was rolan.llanes@gmail.com

and my domain management is https://iwantmyname.com/

Rolan Victor Llanes, RN
Case Manager
Renaissance Hospice