My wife and I file jointly, do we both need to enter the advanced child tax credit payments or just one? This makes a differance of $3000 or $1500, we only got $1500!?!

The overall amount of payment is $1500, but it asks for an amount from both of us, that brings the total to $3000 and takes the same amount out of our return. So, do I just enter the amount in one of the fields or split it between the 2?