I had posted previously about a mistake I made in 2022 when I rolled a traditional IRA that had a total of $71,000 of which $21,000 was non-deductible basis into an individual 401k at Vanguard. I was never able to get Vanguard to fix the mistake or distribute the $21,000 back to me as they had no procedure to do this. I also contributed an additional $6000 to the traditional IRA in 2022 that was non deductible and then converted it to Roth IRA (backdoor Roth). My last non-dedcuctible contribution was in 2020 so that was that last time I had filed an 8606. I am currently trying to do my 8606 for 2022. My traditional IRA currently has no money in it due to the original $71,000 being rolled over to my individual 401k and the $6000 contribution for 2022 being coverted to a roth IRA. On line 2 of 8606 should I put the $21,000 that was on line 3 of my 2020 8606 or should I put $0 on line 2 since I no longer have any basis in my traditional IRA since the prior was inadvertently rolled into my individual 401k.
Thanks for your help.