By past experience, the IRS will send you a notice and form requesting that you sign and return it. That process usually took 4-6 weeks, but ever since COVID they are backlogged and those times have greatly increased to 6-9 months.
I would also suggest contacting a live IRS agent.
Call the IRS: 1-800-829-1040 (hours 7 AM - 7 PM) local time Monday-Friday
Click this link for more info from the IRS on Unsigned Returns
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