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It seems that the authentication method 'service principal' does not work for the SharePoint datasource in Power BI service -> dataset -> settings - edit credentials. By reading some documentation it seems that the only way to get data from the SharePoint API is via client certificates, maybe why it does not work (anymore) for client secrets. I presume this uses the SharePoint resource 'https://microsoft.sharepoint.com' and not the Graph resource 'https://graph.microsoft.com/' under the hood.
Kind regards
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