I believe you should have disclosed the fact that you were using a different SSN when you were applying for DACA. Now, if you never used anybody's SSN and just used your TAX ID, you should just 1. go to a CPA or a TAX attorney and see if you need to refile taxes under the new SSN. And, yes, now you should receive and use YOUR SSN. Good luck.
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I agree with my colleague. use your new SSN.
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