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Hi Dietmar ,

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. If you don't have a work or school account, please sign up for a Microsoft 365 trial and create a work account. Then, sign up for the Power BI service using this new work account.
For more details, please refer to the following article:
Sign up for Power BI with a new Microsoft 365 trial - Power BI | Microsoft Learn
Sign up or purchase the Power BI service as an individual - Power BI | Microsoft Learn

Best Regards,
Dino Tao
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