Here is an article about how to use SSAS tabular model creating report,you can take a reference:https://www.sqlshack.com/create-simple-ssrs-report-using-ssas-tabular-model-database/
Sorry that I am not familiar with SSAS or Power BI ,if you have any questions about SSAS or Power BI ,you can ask on SSAS forum and Power BI forum,
Thanks for your understanding .
Best Regards,
Isabella
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