To clear the data source settings cache
In Power BI Desktop, Go to the File menu and select Options and Settings > Data Source settings
On the "Data Source settings" window, choose the "BI Connector" data sources in the list displayed and select "Clear Permissions". This will clear the credentials cache for the particular data source.
Alternatively, you can clear the credentials cache for all the saved data sources by clicking on the "Clear All Permissions" option. This will clear the credentials information for all the saved data sources.