On mobile Outlook Office.context.mailbox.item.getAsFileAsync((asyncResult) fails (Desktop ok)

[DunhamGitHub]

Office.context.mailbox.item.getAsFileAsync on a Mobile Addin results in Error: You don't have sufficient permissions for this action.

Using an mobile Addin like here and then trying to fetch the currently open Email as file (Base64) through function Office.context.mailbox.item.getAsFileAsync works Desktop but fails on iOS Outlook.

-> How to adjust / what to update for Mobile?

Office.context.mailbox.item.getAsFileAsync((asyncResult) => {
	if (asyncResult.status === Office.AsyncResultStatus.Failed) {
		$('#console').append(' error_office');
		// ---> MOBILE ends here
console.log(`Error encountered during processing: ${asyncResult.error.message}`);
		return;
	}
});