getAttachmentContentAsync does not return anything - outlook

Question

I've read the documentation over on: https://learn.microsoft.com/en-us/javascript/api/outlook/office.messagecompose?view=outlook-js-preview&preserve-view=true#getComposeTypeAsync_options__callback_ , but nothing has been returned. Not even error messages. It doesn't return anything at all. The code i've used is below:
var item = Office.context.mailbox.item;
var options = {asyncContext: {currentItem: item}};
item.getAttachmentsAsync(options, callback);
function callback(result) {
if (result.value.length > 0) {
for (i = 0 ; i < result.value.length ; i++) {
result.asyncContext.currentItem.getAttachmentContentAsync(result.value[i].id, handleAttachmentsCallback);
}
}
}
function handleAttachmentsCallback(result) {
// Parse string to be a url, an .eml file, a base64-encoded string, or an .icalendar file.
switch (result.value.format) {
case Office.MailboxEnums.AttachmentContentFormat.Base64:
// Handle file attachment.
console.log(result.value.content);
break;
case Office.MailboxEnums.AttachmentContentFormat.Eml:
// Handle email item attachment.
console.log("Attachment is a message.");
break;
case Office.MailboxEnums.AttachmentContentFormat.ICalendar:
// Handle .icalender attachment.
console.log("Attachment is a calendar item.");
break;
case Office.MailboxEnums.AttachmentContentFormat.Url:
// Handle cloud attachment.
console.log("Attachment is a cloud attachment.");
break;
default:
// Handle attachment formats that are not supported.
}
}
I have inserted the code for the MessageCompose form and I know that it requires the v1.8 API. I have tested other methods such as getAttachmentsAsync(options, callback) and they work as expected.
As a test, I have been using console logs at specific points where the code works up to. The console outputs the result of callback(result) as OSF.DDA.AsyncResult where status=succeeded. However, it displays "This value was evaluated upon first expanding. It may have changed since then." and it won't allow me to inspect the Object when you click expand.
Additionally logging result.value[i] in callback works as well, with the same issue where I cant expand the object for more details.
Why won't getAttachmentContentAsync return anything?