without his SSN the IRS will deny you the right to claim him as a dependent. there is no way around this. your option is to wait. your return isn't due until 10/15/2021.
Form W-7, Application for IRS Individual Taxpayer Identification Number can't be used because evidently your stepson is eligible to receive an SSN. paraphrased from form w-7 • Don’t submit this form if the applicant has or is eligible to get, a U.S. social security number.
Please note that for tax years 2018 through 2025, you may not claim the child tax credit on either your original or an amended return if your child doesn't have an SSN valid for employment before the due date of your return (including extensions).
was an application for SSN submitted - form SS-5 - because it's the Social Security Adm that issues it. if you are unsure contact them 1-800-772-1213
