If the IRS is holding your return for review, Turbo Tax will not know why. Turbo Tax does not see anyone return, we simply provide the platform for you to prepare them. The best thing you can do is contact the IRS to inquire. However, they should send a letter to you regarding your issue.
How do I contact the Internal Revenue Service (IRS)?
https://ttlc.intuit.com/community/irs/help/how-do-i-contact-the-internal-revenue-service-irs/00/2594...
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