A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Same problem for me.
Context menu for adding comment is not available anymore, in menu "Review" the toolbar buttons are missing, in menu "Insert" I can see a button "Comment" but it is grayed...
Only way to add a comment is using the shortcut SHIFT+F2...
If there are comments in the sheet, I see the context menu entries for deleting, display/hide or editing the comment, but I cannot add new ones.