Are Data Source credentials separate per each Workspace?

Hi michaelshparber ,

Yes. When we use personal gateway, we have to supply the credentials to connect to the back-end data source. So we can enter different one for the same data source.

If we use on-premise gateway, the credential is defined for the data source by the gateway administrator. It might cause refresh failed while adding other credentials.

Refrence:

https://docs.microsoft.com/en-us/power-bi/refresh-scheduled-refresh#gateway-connection