Retirement tax questions

TurboTax does ask if the annuity covers more than one person.

In the 1099-R interview, after you indicate that you want to use the Simplified Method, the following screen appears (along with others):

It's possible that one of your answers on the previous screens caused TurboTax to end the interview for the Simplified Method. For example, when you were asked "For the years that [name] received these distributions, was the amount shown in the taxable annuity box the taxable amount?", what was your answer?

In fact, I am a little surprised that you have to go through the Simplified Method at all - doesn't the OPM have a record of the amount of after-tax contributions made to your pension while you were working? I would have expected them to do the calculation themselves and entered it in box 2a.