Cannot efile MO return. Fed filed and accepted. When I go to pay for state efiling, window says --state efiling is closed so we can get ready for next year--

I called and they did some research and then called me back with a workaround. You have to efile one state return at a time and have them on the phone to give you an unlock code for each state you are filing. Takes some time but it works so give support a call. 

I am having the same issue for VA. This issue is across the board. Nuts.