The foundation that filed its final return must not have entered zero for the refunded amount, which needs to be credited in 2021. In this case, the IRS would have rejected the return.
Your foundation should enter zero for the refunded amount, which needs to be credited in 2021.
Here's how to resolve the error
For any further assistance, we recommend contacting the IRS e-Help Desk Toll-Free Number 1-866-255-0654.