Zoho API Attachment Download Fails

Zoho API Attachment Download Fails

Hi, we are currently integrating zoho into our application, but it seems that I have run into a problem with access. I have full access to everything I am requesting from the API, except when I try to download an attachment. I am able to retrieve the attachment id, and I have been using the same authentication token for all requests.

The error I am getting is:
Code: 4811
Message: Download failed, you don't have access to this attachment.

The error code is not in the API documentation.( https://www.zoho.com/crm/help/api/error-messages.html)

What should I do to gain access to these attachments?