currently TT is only programmed for the 1st stimulus; give it a few weeks for them to adjust the software and everything should work out. Only put the 1st payment you received when answering TT's current question; wait to enter how much you received the 2nd time until the software is updated.
It's going to ask both times what you received; it will not ask what you didn't receive - it can figure that out on its own. Look at Line 30 of Form 1040 and be sure you are comfortable what is listed there before hitting the 'send' button and filing.
TT tends to update software overnight Wednesday night.
