Unable to add members in ArcGIS Online by uploading a CSV file when the organizational language is set to Spanish.
Last Published: March 10, 2015ArcGIS Online
Bug ID Number
March 5, 2015
August 21, 2020
This issue was not reproducible when tested by the development team. Issues may be given this status when they cannot be reproduced or are no longer relevant in a development version of the software, but a specific fix was not installed to address the issue. The issue's Additional Information section may contain further explanation.
Once you save the CSV in UTF8 format it works fine.
Use English headers and change the organizational account to English to add users from CSV.