if you want to Sign up for or purchase the Power BI service as an individual, please have a look this document:
Before you start the self-service process, it's important to learn which types of email addresses you can use to sign-up for or purchase Power BI:
Power BI requires that you use a work or school email address. You can't sign up or purchase using email addresses provided by consumer email services or telecommunication providers. This includes outlook.com, hotmail.com, gmail.com, and others. If you don't have a work or school account, learn about alternate ways to sign up.
You can sign-up for or purchase Power BI with .gov or .mil addresses, but this requires a different process. For more info, see Enroll your US Government organization in the Power BI service.
and if you don't already have a work or school email account, please have a look this document:
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