Feature services successfully published from XLS files return an undefined error around two weeks after the initial publish when accessed by the item owner or admin in ArcGIS Online.

Workaround

• Republish the item using a CSV file.
• Access the content from a non-admin user in the organization or outside user in ArcGIS Online.
• Access the item in ArcGIS Pro using the Portal tab in the Catalog pane.

Steps to Reproduce