This solution absolutely fixed my issue.
Running Turbotax 2021 CD version (desktop). Ran all updates.
Issue: Getting rejected federal and state returns with emailed error IND-031-04 within 45 minutes of submission. Instructions to correct on the turbotax side are vague and inaccurate. The question in the software right before efiling only asks for a 5 digit pin ("You can make up any number") and makes no reference to the 6 digit pin generated by the IRS.
I tried my 5 digit PIN from last year and confirmed my AGI was correct on my turbotax online version and IRS site. Upon resubmit, I again received a rejected return email. Another submit with a fresh 5 digit PIN also got rejected.
Cause of the issue: I chose to 'explore on my own' vs 'guide me' when originally launching the software. I missed the part about 'Did you or any of your dependents receive an IP PIN from the IRS for this year's taxes'. We did. This is a 6 digit PIN. Filling out that section manually as described by mesquitebean has resolved my situation and my returns have been accepted.
Thank you to mesquitebean for the solution.
