You may need to clarify did the second employer withhold too much (greater than 6.2% of box 5)? And/or Was the total of all W2 social security withholding (box 6) over the limit (8853)?
If the first is true, then that is an employer mistake and they should correct the W2 and refund you. If they do not, you must file a form 843 to claim the refund.
If the first is not true, but the second is true, then the excess withholding is added to line 11 on schedule 3 and line 31 on your form 1040 automatically in TurboTax.
Here is Tax Topic 608 for reference.
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