1044 never received stimulus checks

I think you are saying that the IRS Get My Payment tool shows that a payment has been issued but you have not received one or more stimulus payments.

If you have not received one or more of your stimulus checks, you will receive your payment in the form of a Recovery Rebate Credit on line 30 of your 2020 Federal tax return when you file.

TurboTax will compare your one or two stimulus payment amounts to the computations within TurboTax.  The computations within TurboTax are based upon the information that you have entered into the tax software.  If you are due an additional amount, it will be issued as a Recovery Rebate Credit (RRC) on line 30 of the 2020 1040 tax return. 

In TurboTax Online, you are prompted to input stimulus check 1 and stimulus check 2 information under Review down the left hand side of the screen.

You can also access your stimulus check choices by following these steps:  

• Down the left side of the screen, click on Federal.
• Across the top of the screen, click on Other Tax Situations.
• At the screen Let’s keep going to wrap up.  Click on Let’s keep going.
• At the screen Let’s make sure you got the right stimulus amount, click Continue.
• At the screen Did you get a stimulus payment? you can update your stimulus check entries. 

See also this TurboTax Help.

Do you mean IRS provided Notice 1444, Economic Impact Payment?  The form is a record of your stimulus payment and is mailed about 15 days after the payment was made.

If you have not received one or both of your stimulus checks, you will receive your payment in the form of a Recovery Rebate Credit on line 30 of your 2020 Federal tax return when you file.

TurboTax will compare your one or two stimulus payment amounts to the computations within TurboTax.  The computations within TurboTax are based upon the information that you have entered into the tax software.  If you are due an additional amount, it will be issued as a Recovery Rebate Credit (RRC) on line 30 of the 2020 1040 tax return.

If you have e-filed your 2020 Federal tax return and the tax return is accepted by the IRS, you will have to amend your 2020 Federal tax return and correct the entries and calculations to receive the Recovery Rebate Credit.

If you have e-filed your 2020 Federal tax return and the tax return is rejected by the IRS, you will have to correct the entries and calculations to receive the Recovery Rebate Credit as well as correct the entries that generated the rejection.

In TurboTax Online, you are prompted to input stimulus check 1 and stimulus check 2 information under Review down the left hand side of the screen.

You can access your stimulus check choices by following these steps: 

• Down the left side of the screen, click on Federal.
• Across the top of the screen, click on Other Tax Situations.
• At the screen Let’s keep going to wrap up.  Click on Let’s keep going.
• At the screen Let’s make sure you got the right stimulus amount, click Continue.
• At the screen Did you get a stimulus payment? you can update your stimulus check entries.

See also this TurboTax Help.