Did you enter your SSA1099 in the right place?
Go to Federal> Wages & Income>>Retirement Plans and Social Security (SSA1099 and 1099RRB) to enter your SSA1099.
Look on line 6a and 6b of your Form 1040.
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
To enter Social Security benefits reported on form SSA-1099
Or enter ssa-1099 in the Search box located in the upper right of the program screen. Click on Jump to ssa-1099
Social Security benefits received are shown on your federal tax return Form 1040 Line 6a and the taxable amount of the benefits on Line 6b.