EPM rest API to add users to group by Upload file throwing error

Summary:

EPM rest API to add users to group by Upload file throwing error

Content (please ensure you mask any confidential information):

using EPM REST API to add users to the group but recieving below error(Please see attached screenshot as well):-

Error message=>
Failed to add groups. File either does not have valid header or encoded with invalid format. Please provide a valid file.

Version (include the version you are using, if applicable):

24.10

Code Snippet (add any code snippets that support your topic, if applicable):