Then you should have qualified for Child Tax Credit if you met all other requirements.
One other issue might have been how much earned income you had because only up to $1,400 of the credit is refundable and is phased-in based on your earned income. In most cases, you must have $2,500 or more of earned income to be eligible for any portion of the refundable Child Tax Credit.
If you had earned income of more than $2,500 then you might want to amend your 2019 tax return to try to claim the Child Tax Credit.
But it might be tricky to use TurboTax if you filed your return somewhere else. To amend a return you did somewhere else, you would first have to fill out Turbo Tax like you are doing the original return and pay for it using the TurboTax 2019 software. You have to recreate the actual wrong original return. Then when it matches each line from the return that the accountant filed for you then you have to tell Turbo Tax that you want to mail it so it thinks it was filed. Then you can amend it.
The accountant might have referred to the Earned Income Credit (EIC) because the 6 months lived in the US is a requirement for the EIC. Maybe check lines 13a and 18b if you got the Child Tax Credit.
[Edited 2/24/2021 | 1:38pm PST]
@yuliyash1106
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