To use a technical term, the Disney website "stinks". For a huge corporation, you think they would have this down to a science. My husband is in the computer field and tests software for a major financial institution. He cringes everytime I tell him about the Disney site. He said that if his website was like that, he would have been fired.
Okay, off my computer soapbox now and back to your original question. Chances are that it is sold out as there are only 5 standard concierge rooms to begin with on that floor. In my experience with their on line system, don't pre-select concierge or suite options. This only seems to confuse it. For this request, I would give them a call. I don't have the 1-800 number, but I have seen it posted recently. That will save you the cost of a long distance phone call anyway.
Tammi