from IRS ip pin faqs.   Talks about voluntary IPPins… silent on assigned by IRS

Q23. Can I opt-out of the IP PIN program? (updated March 18, 2025)

A23. Yes, if you voluntarily joined the IP PIN program and have not been a victim of tax-related identity theft, then you may opt-out of the IP PIN program. To find out if you are eligible to opt-out, please log into your online account. If you enrolled into the program though the one-time enrollment option, you will be opted out of the program at the end of the calendar year.