There is such a Form.
https://www.irs.gov/pub/irs-pdf/i5884a.pdf
Is it applicable to your client's situation?
If you are asking about the covid credit, you got bad guidance and wrong advice. The Form 5884A is for disasters, such as flood. You are asking about "ERTC" for covid, not ERC, factually.
You can read all of this topic to understand the difference:
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