Automated Refresh not Working

Hello StudentAssist 

Please check that, incorrect data source credentials can prevent the refresh from being scheduled or executed. Make sure that the credentials for all data sources are correctly set and up-to-date. Make sure that gateway is online and configured correctly.  

Please visit below accepted solutions, It might helps you to solve your issue.

Solved: Scheduled Refresh is grayed out - Power BI - Microsoft Fabric Community

Troubleshoot refresh scenarios - Power BI | Microsoft Learn

Refresh summaries for Power BI - Power BI | Microsoft Learn

Thank you!