I have replied also by email, with an example of a working shared note. But looking at yours the issues are:
You need a blank line between the title and the content of the note.
Because it is a table you must have the same number of cells in every row. Each cell separated by “|”
You do not need the start and end_formatted_area code
You do not need anything between two “|” characters for an empty cell.
Remember, this is NOT markdown. It is just a couple of codes designed to force a display of text into an html table structure. It was designed ONLY for the census assistant. It can be used for other shared notes, but only in a very limited, and technically “unofficial” way.