Hi,
Thank you for asking your question! If your dependents were not on your 2020 return, the IRS will not know to include you in the advanced child tax credit check program. You have the option to wait until next year to get your full credit on your tax return. If you would like to receive payments monthly in 2021, you must log in to the IRS portal to do so. Some of the functionality, what you can and can't do, of the IRS portal, is being introduced in phases. There is a link within the IRS Advanced Child Tax Credit link below to assess eligibility.
Here is where you can get the latest information:
IRS Advanced Child Tax Credit Portal
IRS Advanced Child Tax Credit FAQs
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