For me, the order status site has always been fickle. Some days it works; some days it just sits and spins after clicking "Accept and Track". But would usually give my info after a few tries over a couple hour period. As mentioned, I ordered in July and on Sep. 07, it was scheduled to be built the week of 10/09. On 10/08, they changed scheduled build week to 10/30. That was a few days BEFORE the Kentucky plant closed. I checked once since then but it hadn't changed. Since others said theirs changed after the closing, I just went to check mine now.
I got the same error message as you: “We're sorry. We are unable to process this Order. Please enter a valid Ford Order/VIN.”
Since Sep. 07 when my status first changed to having a scheduled build week, I've never seen that before.