As you probably know, the Department of the Treasury handles an offset program which removes amounts from refunds - see https://www.fiscal.treasury.gov/TOP/
The letter that the Treasury sends a taxpayer explaining what has been done is sent separately from the refund itself (which is usually a direct deposit).
With the current COVID-19 situation, many government offices are running at reduced capacity, so your letter may literally be "in the mail".
You can use that link above to find the phone number for the TOP program to call and ask.
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