A Microsoft file hosting and synchronization service.
Hi Leonardo,
Sorry for the inconvenience it has caused. OneDrive does have a setting that not allow user to create new folder. Let's first find out whether it is the reason in our case.
You can try OneDrive Online and create the folder in the location and see if there are any error messages pops up. If yes, please share a screenshot with us. If not, it means that OneDrive allows you to create new folder, and we need to look in your Mac.
If these error only happens when you create the folder in your Mac, you can right click OneDrive icon on the top menu and Quit OneDrive. Then open your finder and create the folder see if the error happens. Without OneDrive's influence, you should be able to create the folder in your Mac just like you can in other locations.
Welcome to share the result with us for further support.
Regards,
Alex