My wife received her 2nd stimulus ck and I did not what should I do?

I had the same situation and I called the IRS.  They told me to simply take a credit on my 2020 tax filing.  In essence, the stimulus check should have been for both of us.  My wife received a debit card for $600 and I did not get anything.  When I completed the taxes, the question is did you receive $1,200.  I answered no and was asked to input the amount received and I received a $600 credit against my 2020 tax liability.  The payment was an advance against the $1,200 tax credit and since we received $600, I received the $600 balance as a credit against my tax liability.

If you did not receive second stimulus payment , you can claim it on your 2020 tax return as the Recovery Rebate Credit.

In TurboTax Online, to claim the Recovery Rebate credit please do the following:

1. Sign into your account and continue from where you left off
2. Click on Federal in the left-hand column, then on Federal Review on the top of the screen
3. On the next page titled Let's make sure you got the right stimulus amount, click on Continue
4. Follow the interview
5. TurboTax will determine whether you are entitled to any additional stimulus
6. Any stimulus amount remaining due to you will show as a credit on line 30 of your form 1040.