If you have a 6 digit IP PIN, you are supposed to use it and IRS assigns a new one to you each year. That is what is supposed to display in the signature area by your signature line. Please review what the labeling on the line where the 5 digit pin has been entered says. Make sure it refers to needing the 6 digit IP PIN in that location.
You need to go back to that IP PIN section of the return and re-enter the new 6 digit IP PIN. It will probably reject if you leave last year's 5 digit self-select pin in that IP PIN location.
Then, when you get ready to e-file, you can enter the 5 digit self-select pin.
