Perhaps your book cover has something that violates the platform's condition or is mildly revealing? I'm not sure since I can't see your book cover. Maybe upload it here so we can what's wrong.
I am unable to publish or save as the UI publishes or saves indefinitely.
I've been having this issue since a few days ago and this happens when I copy and paste large chunks of words from my Word document to scribble hub. Please advise.