Agreed I did the same thing this year and been a customer for 6 years. I didn't realize it was different account until after I already paid. There should initial question like where did file your taxes the previous year with an option of turbo tax. So if there is no record perhaps you are using the wrong account.
If I didn't already pay for it, I would have just done them over on the other account. In today's technological world I would think this should be possible if anything at least let me import the filed PDF from the other account as past taxes. So I don't have to continue to login to the orphaned account. I am really surprised to see that this isn't possible. Usually Turbo Tax has such great customer friendly experience.
