I got a letter from IRS saying I must mail all income forms (W2, 1099's) to them to validate my 2022 return filed thru TurboTax. Why did this happen?

2022 federal taxes e-filed with TurboTax in 02/2023 and was accepted by IRS. IRS says they can't process the return and need more information and I must send income forms.  This never happened before, so why now?  Why didn't TurboTax supply all the necessary information?