Pushing data to a dataset automatically

Hi dsmhood,

Thank you for reaching out to Microsoft Fabric Community Forum.

The ability to push data to a Power BI dataset using the /rows API is not supported by default for service principals. This is a known limitation in Power BI's API access model.

To enable this functionality, specific tenant-level configurations are required.

Please refer to the following Microsoft documentation, which outlines the necessary steps to configure service principal access and may help resolve the 403 error you’re encountering
Embed Power BI content in an embedded analytics application with service principal and an application secret - Power BI | Microsoft Learn 

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Regards,
Vinay Pabbu