In filing my 2020 return with Efile I used my "self service" 5 digit pin. The IRS rejected it. The TT email said I need a 6 digit IP PIN, but did not say how to get it. I searched Bing and the IRS site for IP PIN popped up. I have a IRS account (easy to set one up) and logged. Found the site to request a IP PIN. I got one with an email and saved it to my PC. Went back to TT and started the filing process. When it asked for my IP PIN I entered my new 6 digit IP PIN. (if married spouse does not need one). I filed and got email from TT that IRS accepted my return. A bit latter, TT says CA accepted my state return. CA will not accept a EFile return unless IRS accepts first. Not sure but I think you need a new IP PIN every year.
