Bulk Ops - Unable to delete users

[IT Team]

Hi

I just installed the Bulk Ops App / Addon on my JIRA Cloud. Then I exported all the users and based on the Help displayed at the bulk delete page:

https://bulkops.herokuapp.com/delete_users/bulk_delete

I uploaded the CSV file as:

==

accountId,displayName
557058:XXXMMMXMX,Name1
557058:dkkdfkdnfkn13132,Name2

====

However I get 404 error . These users are actually with their status = active, billable = no flag set on them.

How to resolve this error?