This problem is caused by DNS caching. This is normal, because the account was created less than 24 hours ago. You can learn more about this here:
But whatever you do, do not remove or re-add the domain, do not deactivate and reactivate the account, do not setup a new account. Just leave the domain alone. It will fix itself, and the more you start fiddling with it, the longer it will take to start working for you.