You are accessing the FileMaker server via WebDirect, means via webbrowser (not via FileMaker clients) -> WebDirect does not support every method. TableView is not supported
That's insane!! But thanks. Any chance there will be a fix to this in the future?
FileMaker Inc. does not announce new features or bug fixes in advance so it's anyone's guess.
But you can replicate most features of a table view using list view so this isn't likely to be a limitation keeping you from getting this to work.