Did you claim more than one dependent? Look carefully at the rejection notice----there will be a "01" "02" etc in the notice. Then look at the dependents as shown on your Form 1040. 01 is the first name, 02 is the 2nd one, etc. etc. That way you will know which dependent's SSN was used already on a return. Do you have any teenagers or students who may have filed their own tax return and did not say they could be claimed as dependent?
PREVIEW 1040
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-retur...
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