I have an Asset (ID1574591) that is hanging during the archiving phase after enabling “Make Available for Offline Download”.
I had a similar issue recently with a different Asset, here is the link to the history on that one: Make Available for Offline Download Stalling at the End.
The archive has since failed with the message " There was an error while processing the asset to be downloaded. Use the toggle to start the process again.".
But when I move the toggle the error just reappears instantly.
I got this working by uploading the tileset again and retriggering “Make Available for Download”.