When you want to create an account from your cPanel account, you might get the following error.
Sorry, that username is reserved
To get this issue fixed, please check if you using “test” or “demo” as the cPanel account username. The restriction only limited if the username start from “test” or “demo”.
To fix it, you may simply change your username to have some character before “test” or “demo”. Example, “1test” or “1demo”.