No one should be using their SSN, that is just plain STUPID. A PTIN is required: Anyone who prepares or assists in preparing federal tax returns for compensation must have a valid 2023 PTIN before preparing returns. All enrolled agents must also have a valid PTIN. https://www.irs.gov/tax-professionals/ptin-requirements-for-tax-return-preparers
You certainly could step in and just become the preparer. I hope you are happy with the choice you made to assume total responsibility for everything this other person has done so far.
How in the world did you engage a preparer that did not yet have a PTIN?
Get an EIN pretty much immediately, if you qualify:
And stop giving out your SSN.
If you want to efile:
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