I am trying to sell a stock and I put in my unlock code. Immediately after, the screen announces that an unlock code is needed. I can't sell my stock! Help?

Hey Rhema, do you have a lock code on your account?, please check your settings (then select Account Settings Tab).

If there is a lockcode and you are having problems with it, then you will need to submit a ticket to the Player Support Team using the help tab above the game screen.