I've never needed an IP PIN, but I got one because TurboTax said I had to do that after IRS rejected. On TTAx Desktop Premier 2023, the URL to get an IPPIN from the IRS is incorrect (404 error) I found the correct IRS form and got an IPPIN. TTAx Desktop Premier 2023 does not allow me to enter the IPPIN on the 1040 form. I will have to manually enter it and mail the form in. I contacted support to ask for a refund, I was given a complete runaround. I will hound them until I get a refund.
