Well, You just enter your SSA-1099 into TTX in the correct spot. Then TTX will calculate the taxable portion and put it on line 6b for you...but YOU have to make sure you enter all your various 1099 forms in teh corrct spot of the income menu . I'm not sure why you thought TTX would enter them for you. (unless you actually did buy the upgraded service to have an agent help you prepare your forms)
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Yes, some 1099-R form types can be imported directly into the TTX software, and data auto-entered if you "initiate" the import, but that depends on who is providing that form. Not all of those forms can be imported, and depends on the supplier of that form creating the specially-formatted data.....and many suppliers don't and you then have to enter the data manually. The SSA-1099 from Social Security has never been provided by the SS admin as a tax file import...they might in the future, but they haven't yet done so.
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Another thing you should check, is the other lines on your form 1040 for 2020. You might have mis-entered your SSA-1099 in the wrong spot. So look at the totals on lines 4a,4b (IRA 1099-R forms) or lines 5a,5b (other pension 1099-R forms) to see if they match what other 1099-R forms you entered....you might have mis-entered your SSA-1099 in one of those lines....and if you did, then you were actually over-taxed and the IRS may actually owe you some extra refund once you correct the mis-entry of the SSA-1099.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
