If TurboTax is asking you to enter a five-digit pin on your signature page to file your taxes, you can just make up a five digit number and write it down. You can create a new 5-digit PIN every year, if you like.
If you are talking about an IP-PIN, this is an Identity Protection PIN (IP PIN). It is a 6-digit number that the IRS gives taxpayers who were victims of tax-related identity theft.
If you got an IP PIN or CP01A notice from the IRS in the past (or you opted in to the pilot program), you must use your 2024 IP PIN to prove your identity when you file your 2024 return.
TurboTax can not issue IP PINs and you won't find them on your tax paperwork. You can only get IP PINs from the IRS.
Click here for What is an IP-PIN?