Sharepoint Data Source file Invalid Credentials in Service

I have created a power BI report that has two data sources (SQL On-premise via Gateway and a Sharepoint file in O365).

I can connect to and view both data sources without issue in desktop but after publishing the report to the services I am unable to refresh the report.  In the service my SQL source is fine and I update the Sharepoint file to use Oauth2 because of "Invalid Credentials" when trying to connect to the Sharepoint excel file.

In PBI Desktop my connection to our O365 Sharepoint site is set up like this:

let
    Source = SharePoint.Files("https://MyOrg.sharepoint.com/sites/ENTBIR", [ApiVersion = 15]),

and in the portal I sign in with my credentials which absolutely have permssion to view the data.  

After updating the credential for sharepoint the X next to it goes away which tells me all should be good.

But when I click on the dataset and select "refresh now" I get

Last refresh failed: Mon Jul 01 2019 15:16:04 GMT-0400 (Eastern Daylight Time) 
Invalid connection credentials.Hide details

Has anyone else had this issue?  What can i do to get this refresh working in the service?