OK, now I’m following things.
Focusing specifically on your restore needs, I’m not sure if there’s an “oauth log” that @kenkendk can look at that might give us more detail.
Alternatively, if you’re goal is to restore pretty much everything from your backup, then if you have the space you could pull the Duplicati files from your Google Drive to a local drive and do the restore from there.
Again IF you’re going to restore “everything” then (assuming the oath issue is resolved) Duplicati would just be downloading *most of those files from Google Drive anyway. (*most fits if you have few versions of files, but if you have a LOT of versions or are only planning to restore a few files then Duplicati would only download the archive files it needs for those versions / files.)