I found the following guidance from the IRS IP PIN website, and I believe that it might help you with your current situation. If you aren't able to retrieve your IP PIN online from the IRS website, I would give the number below a call and see if an assistor can help you resolve this issue so that you can finish and submit your return.
How to get your IP PIN reissued
If you're unable to retrieve your IP PIN online, you may call us at 800-908-4490 for specialized assistance, Monday - Friday, 7 a.m. - 7 p.m. your local time (Alaska & Hawaii follow Pacific Time), to have your IP PIN reissued. An assistor will verify your identity and mail your IP PIN to your address of record within 21 days.
Exceptions:
- If you’ve moved since January 1 of this year, or
- It’s after October 14 and you haven’t filed your current or prior year Forms 1040 or 1040 PR/SS,
you’ll need to complete and
mail a paper tax return
without your IP PIN. We’ll review your return to confirm it’s yours but this may delay any refund you’re due.
https://www.irs.gov/identity-theft-fraud-scams/retrieve-your-ip-pin
