Most likely Microsoft re-wrote OneDrive yet again in Windows 11, broke compatibility with other things, and nobody reported it to them during the beta (or they ignored the reports), so it wasn't fixed before release.
We'll add it to our list to look at and see if we can find a workaround. I'd advise against jumping on Windows 11 this early unless you have a compelling reason to.
Edit: Thinking about it, they've probably dropped the old OneDrive context menu entirely and replaced it with the one that works with File Explorer's new context menu type. (The one that hides most items and takes several seconds to display a menu despite the menu being simplified. It's a trainwreck, this OS update.) We may need to add support for that style of menu item (if it's possible outside of File Explorer; they've done things in the past that wouldn't work in other processes) or a way to simply display the shell context menu itself, but it may also depend on how/whether other developers adopt it, and whether Microsoft backtrack on it (as the new menu implementation is being widely criticised, aside from the visual design which people seem to like)
In my case, I have lost all OneDrive context menu items.
I used to have them all and although I am 99.99999% sure that the issue only occurred after upgrading to 12.25, if I completely uninstall it and then re-install the previous version, the issue is still there!
After upgrading to Windows 11, I used "Free up space" frequently; now it is no longer there in the DOpus context menu and I have to use File Explorer instead.
FYI: screenshots and further version detail of my experience at Windows 10 OneDrive context menu - #12 by gPaq. Note that VLC managed to make its way onto the context menu, other assorted items such as OneDrive unfortunately not...
Hey, just wanted to let you know, I tried out the patch this morning, worked beautifully, I have full functionality of Onenote back. Ran the install, only had to restart the program, not the PC. Only have Windows 11 on my personal PC, which uses the home edition, haven't tried with sharepoint or enterprise.
OneDrive context menu items aren't working for me either on Windows 11. They appear in explorer windows. I've tried 12.25, 12.25.3 and 12.25.4, using clean installs and using old profiles where it worked under Windows 10.
I have installed the production version 12.26 and OneDrive context menu is available on both vertical sides of a Directory Opus window. Thanks for that update, this seems to have fixed the issue... perhaps until Windows 12