Using classic Outlook for Windows in business environments
Try this: Web Your sticky notes also sync with the web. Go to www.onenote.com/stickynotes to view them. You might have to log in to your preferred browser with your Microsoft account credentials.
I have done this and been able to retrieve my notes and it’s made me feel lot better that at least some are there !! Hope this helps and works for you!! It didnt work on outlook browser but worked on my iphone safari browser..