Investors & landlords

I've been trying since January with TurboTax to get Installment Sales fixed for 2020.  We sold a rental in 2015 and it has worked perfectly every year until now.  I enter the interest received and it populates the Schedule B correctly.  However, I enter the principal received an NO forms are populated....no 6252, no 4797, no schedule D, nothing on Line 7, 1040 nor any amount on my state tax return.  I use turbotax online premier.  In our investigation, we realized 6252 was not generated in 2019, but was generated in previous years.  I think this is the problem, that the database is trying to pull data off 2019 6252 and it is nowhere to be found.  But I CANNOT get anyone at TurboTax to understand that , nor fix it!!!!  I even tried to amend 2019, thinking it would generate a 6252, but the amendment didn't, so I cancelled the amendment.  Now they're trying to tell me to pay for a CPA to see if I entered everything correctly.  It's worked perfectly last 5 years!!!  I believe the database function is written to look for the 2019 6252 and it is not there, but I can't get anyone at turbotax to understand that.  And I can't get a refund!  I was wondering if we are having similar issues????