Hi Tiffy I had the same problem, There are various solutions;
1. If you did your taxes with TT. , you can find the pin on one of the last pages of your prepared and sent taxes,
2. I you can't find it there, there a section where you can provide proof of who you are by providing your drivers license number or your AGI from last years taxes. AGI stands for Adjusted Gross Income. You can find that on your 2018 (1040).
