Semantic model displays empty tables from Dataflow

Hi DataVitalizer , Thank you for reaching out to the Microsoft Community Forum.

This is most likely a credentials/permission or refresh materialization issue. Re-enter the Power BI Dataflows credentials, fully refresh the dataflow, then refresh the semantic model. If it still shows headers only, materialize the entity (create a staging table), re-link it to the model and if that fails export/import the dataflow.

If none of that works, I suggest collecting the refresh logs and opening a Microsoft Support ticket. Below is the link to help create Microsoft Support ticket:
How to create a Fabric and Power BI Support ticket - Power BI | Microsoft Learn

Also, please refer:

Troubleshooting dataflow issue - get data from dataflow - Power Query | Microsoft Learn

Configure and consume a dataflow - Power BI | Microsoft Learn

Understand and optimize dataflows refresh - Power BI | Microsoft Learn

Connect to Power Platform dataflows in Power BI Desktop - Power BI | Microsoft Learn