If the pin isn't accepted by the IRS, you'll receive a rejection notice and TurboTax will assist you with entering a new pin. If you receive an acceptance for your returns, there is no need to worry that it will cause problems later - allowing electronic filing is the sole purpose of the pin.
I think The 5 digit pin is a number you can make up each year. It doesn’t have to be the same number each year. Just write down the number in your tax file in case anyone needs it. Write it in a post it and stick it on your tax return copy. My pin transferred over from last year so I just used the same number. I have no idea what it’s used for.
In my password manager I have two different PIN numbers.....one is something i created the other is something that I would never of created.. i switched out computer after same one for 10 years.. and am concerned which is correct. Hopefully I get the message with the one I did not create as it was prefilled this year. thanks for your response.