Originally Posted by Betelgeuse451

Were you trying for an upgrade from an existing New Category, or from an Old Category? I like to use the word "conversion" - my current read is that Marriott does not want to allow certificates to be upgraded, for whatever reason. However, if you hold an unconverted Old Certificate, they need to make a change to it anyway so it doesn't matter much to them what New Category you want (as long as you pay the difference of course).