Thank you! I found an answer also on IRS.gov finally. It states: If you and your spouse did not receive one or both Economic Impact Payments because one of you did not have a SSN, you should complete the Recovery Rebate Credit Worksheet or use tax preparation software to determine if you may claim a Credit on your 2020 tax return for the spouse with the SSN. If eligible for a Recovery Rebate Credit, you can claim it on line 30 of your 2020 tax return.