Did you send tax due checks with them? Were they cashed? Did you get a letter from the IRS saying they didn't get your 2020 return? And you mailed Federal and state in separate envelopes to different places, right? The IRS has been sending out letters but they might be a mistake.
The IRS sent out a lot of letters. The last couple years were a mess and the IRS got way behind processing returns.
IRS suspending notices
https://www.irs.gov/newsroom/irs-continues-work-to-help-taxpayers-suspends-mailing-of-additional-let...
See this CNN article requesting another copy
https://www.cnn.com/2022/02/11/success/irs-tax-letters-suspended/index.html
