OData Authentication Issues

I have two apps, both that retrieve data from an S/4 HANA system. One retrieves sales orders and the other materials.  The URI for each works in a browser tab once I log into the Fiori launchpad so I know the credentials and the URIs are correct.  The Sales Order app works.  The data is retrieved and displayed.  The material app does not work and I'm getting a 401 error on the Get list activity.  Everything is identical between the two apps except the URI. I'm baffled and I've run out of troubleshooting ideas.  I would appreciate any suggestions.   Ross
1 answers

We've been trying to find a log that has the relevant data and have been unsuccessful.  Do you have any suggestions?