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Hi, cwilsonLUR 

The "Data Source credential" is always used for the data source in the cloud instead of on-premise.

According to your screenshot, you can see that your data source is xlsx, the first thing to confirm is whether your xlsx is from your local computer, if so, you need to download the local data gateway to interact with your local computer resources.

An on-premises data gateway is a bridge for cloud interaction with on-premises.

You can download it in this website:

Power BI Gateway | Microsoft Power BI

For more information, you can refer to :

On-premises data gateway - Power BI | Microsoft Learn

And you need to configure the each .xlsx credential in this gateway, the detailed steps you can refer to :
Add or remove a gateway data source - Power BI | Microsoft Learn

Thank you for your time and sharing, and thank you for your support and understanding of PowerBI! 

Best Regards,

Aniya Zhang

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