Tax Refunds

When I filed my 2019 returns the TIN for my kids had expired. The TINs were renewed as of May 2021. The IRS gave me a reduced refund, how can I claim the balance amount from the IRS

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I have a similar situation. IRS asked me to pay the amount as my kids I-TIN was expired. I have paid the amount. I have re-activated the I-TIN. How to request for refund ?

Since the IRS changed your return you must start with the changed figures and mail in an amended return to get anything the IRS denied for the out of date ITIN.