ERROR
Attempting to upload a CSV file and selecting the 'Add <file name> and create a hosted feature layer or table' option in ArcGIS Online fails and returns the following error message:
Error: Duplicate field names
Duplicate field names are not allowed.
Two or more fields in the CSV file share the same name or are duplicates. Field names of hosted feature layers must be unique and not identical to one another.
Note: For complex tabulated data, refer to Microsoft: Find and remove duplicates to locate and delete duplicates.
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