Hello @PhoebeK 

If emailAttachmentList is a DynamicArray, then the following property declaration is correct:

Attempt 2 // 
Property emailAttachmentList As List of Request.EmailAttachment(%JSONFIELDNAME = "emailAttachmentList");

It looks like you're trying to set the value directly like:
    callrequest.emailAttachmentList.attachmentClass = "application/xml"

However, since emailAttachmentList is a list, you need to either:
- Use %JSONImport(response) to populate the list properly (e.g., `callrequest.%JSONImport(response)`), or
- Loop through the list and set the property on each individual item, like this:

For i=1:1:callrequest.emailAttachmentList.Count() {
  Set callrequest.emailAttachmentList.GetAt(i).attachmentClass = "application/xml"
}