I'm using the guide shown here to to Get Data from Azure Data Lake.
https://learn.microsoft.com/en-us/azure/analysis-services/tutorials/aas-lesson-2-get-data
Everything appears to be working fine. However, when I 'Import' from Power BI's Power Query Editor I get the message error message 'Failed to save modifications to the server'. I believe the underlying problem is the column 'Date Created' is Null, but I can't seem to delete the column. I think the issue has something to do with Permissions, however I am the owner. I have include a few images to illustrate the problem.