defaultSymbol links to https://fontawesome.io/icons/ which gives page not found error.
Also, latest MM update (Apr '22) changes fa library version, possibly causing icons to no longer load.
e.g., fa-calendar-check-o (fa v4) no longer works.
Backward compatibility ought to be implemented to accommodate older fa library versions.
Instructions need to be fa library version specific.