Hello, I am using Office 2016 and Windows10. I have 4 files all in a SP doc library - 1 main file with connections to 3 Excel files in the same library. I originally set up the connection using Data > New Query > From File > From (Excel) Workbook. Users had permission errors, I did some reading and later changed the connection to Data > New Query > From Other Sources > From Web. Users got the same error. I have the setting checked off to auto refresh the connections when the file opens. I have not received any error messages when using either connection type. Users are receiving a popup that says:

[Permission Error] The credentials provided for the Web source are invalid. Please update the credentials through a refresh or in the Data Source Settings dialog to continue. (Source at http://xxxxx/xxxx/xxxx/Shared%20Documents/xxxxxx.xlsx

I am using Credentials = Windows and Privacy = None. My permissions in SP = Full Control and users' permissions in SP = Read. I have tried elevating the users' SP to Edit but it didn't help. I have searched the internet for a solution and have tried many things to no avail. If anyone has any suggestions for what I can do to ensure a successful connection and automatic refresh for my users, I would be ever so grateful! Thank you.