An ERC is filed on a 941 X, which is a standalone form that is filed separately and not from a tax return. it needs to be printed and mailed by April 15. Here are a couple of IRS sources for you to review, including a pdf form you can download, fill out, and mail. Turbo Tax Business does not support a 941 X.
Copy of 941 X
IRS Instructions for 941 X.
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