Your return is correct as is. If you manually go through the Worksheet 4 from the instructions for line 8c, you see it is just a poorly worded line item on the return. It is calculating the maximum credit allowed. Since you left the section blank, it is correctly not reporting any credit to the amount you owe.
For access to the Worksheet or more information on Schedule H please see 2021 Instructions for Schedule H (2021).
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