Early this month, Microsoft announced that Sticky Notes can be now accessed from OneNote mobile apps on Android and iOS. Today, Microsoft announced that Sticky Notes can be now accessed on the web at http://www.onenote.com/stickynotes. With this support, you can get access to your sticky notes from anywhere. Microsoft will be rolling out this feature worldwide soon.
On a related note, Microsoft today released a new Windows Insider build that comes with an updated Sticky Notes app (v3.1.32). This updated app includes improved dark mode and faster sync performance.