First of all, you should have seen a notice after you entered your W-2 forms mentioning you were getting some cash back:

And when you look on your Schedule 3, part II, line 11 your social security tax refund should appear:

If not, are you sure your total social security wages in box 3 of your W-2's is over $168,600? If everything checks out, make sure you have done your updates if you are using the desktop version of TurboTax. You next step would be to delete the W-2 entries and re-enter them.
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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