SSRS 2016 Connection/Permission Error

I'm getting a connection error when trying to render a report using SSRS 2016 Report Manager.  Here is my setup:

For testing purposes, I installed SQL Server 2016 Developer on a Windows 10 Professional laptop.  As part of the SQL Server installation I installed SSRS 2016, on the same laptop.  Then I configured SSRS 2016 and everything seems good to that point.

I created a new data source (DataSource1) and a test report in Visual Studio.  The report previews perfectly while in Visual Studio, so I deployed both the data source and the report to the Report Manager.  

I see the report and data source when I open Report Manager web page.  However, when I run the report I get the following error:

"...Cannot create a connection to data source 'DataSource1'. (rsErrorOpeningConnection).  A network-related or instance-specific error occurred while establishing a connection to SQL Server.  The server was not found or was not accessible..."

When I test the data source in Visual Studio it works.  When I test the data source from the Report Manager web page I get the same error as above.  

It seems simple enough but I can't figure out what the issue is.  I am using Windows authentication and I'm the admin for the laptop as well as the SQL instance.

Any help would be appreciated.  Thanks.
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CalBobAuthor Commented:
I found out that SSRS 2016 is set up slightly different in terms of data sources in Report Manager.  If you are using a Windows account (or Windows Authentication) you have to select it from a drop-down list.  In earlier versions, there was a checkbox under the credentials you enter - so I missed the change.  

I have included a screen shot of the change and solution for me.  Now it seems simple.  Thanks for you suggestions.

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CalBobAuthor Commented:
I found the problem and included a screen shot and explanation.  Thanks.
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