Sign up user who is created from new Azure Active Directory

[cuongle]

I follow the tutorial from website to create new Azure AD tenant and create organizational user for this new tenant:

https://powerbi.microsoft.com/en-us/documentation/powerbi-developer-create-an-azure-active-directory...

https://powerbi.microsoft.com/en-us/documentation/powerbi-developer-sign-up-for-power-bi-service/

But when I use this new user  to sign up Power BI service, I get the error as below, how to overcome this?

My Azure AD:

The error:

[chrichua]

If you are the administrator for your tenant, please follow this guide to enable ad hoc subscriptions so users in the tenant can sign up for Power BI:

https://support.office.com/en-us/article/Power-BI-in-your-organization-d7941332-8aec-4e5e-87e8-92073...