Rejected due to 5 digit Signature ID not matching IRS database. First year using Turbotax. I created one this year. Does my last year paid preparer already have one?

I am having the same issue. It's maddening! 

The IRS uses your prior year AGI to combat fraud.   

You can find your 2023 Adjusted Gross Income (AGI) by:

• Looking at line 11 on page 1 of your 2023 Form 1040
• Requesting a transcript of your 2023 tax return from the IRS. You can request your transcript online at the following link: Get Transcript 

Please click on this TurboTax article for more information. 

Check these items as well to ensure you have the correct number.  If you: 

• Filed late last year after mid-November or your return was processed after that time—try entering 0. 
• Amended your return last year—make sure you’re using the AGI from your original return, not the amended one. (If you only have a 1040X form, it’s on line 1, column A). 
• Rounded your AGI to the nearest dollar—be sure to round up when it’s 50 cents or more and down when it’s 49 cents or less. 
• Filed with your spouse last year—you and your spouse have the same 2023 AGI. (Don’t split the AGI amount or enter  0  for one of you). 

Time-saving Tip: If what you entered is correct and you continue to get a reject, you won't be able to e-file. There's probably a data mismatch at the government, or some other situation beyond your control that prevents your return from being e-filed. In this case, your only option would be to print and mail in your return. 

This article will give you instruction on how to print and mail your return.