user authentication needed when uses embed PowerBi

Hi pedroEmb ,

To achieve a single sign-on experience, use the Embed in SharePoint Online option, or build a custom integration by using the user-owns-data embedding method.

Embed a report in a secure portal or website - Power BI | Microsoft Learn

powerbi - View Power BI Embed Report using Single Sign on - Stack Overflow

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When the user's login to the app for the first time, you can get the access Token in response.

For Embedding any report, we need embed URL and access Token.

You can get the access Token from the above and it will be of token Type AAD.

Use this accessToken as Bearer token to hit the Get Report in Group REST API to get the Embed URL.

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Best Regards