they did not specify what information was needed just I have 20 days to comply
What is the notice number on the correspondence received from the IRS? It should be located in the upper right of the first page usually preceded by a CP or LTR? There is also a phone number on the notice that you received if you have questions or disagree with what is being requested.
<a rel="nofollow" target="_blank" href="https://www.irs.gov/individuals/understanding-your-letter-0012c">https://www.irs.gov/individuals/understanding-your-letter-0012c</a>
See this IRS website for information on IRS notice LTR0012C - https://www.irs.gov/individuals/understanding-your-letter-0012c
See this TurboTax support FAQ on the procedure to use concerning the IRS notice - https://ttlc.intuit.com/questions/3155571-what-do-i-do-if-i-received-an-irs-letter-about-a-missing-f...