Per the IRS form 1040 instructions page 76
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
If your return is signed by
a representative for you, you must have
a power of attorney attached that specifically
authorizes the representative to
sign your return. To do this, you can use
Form 2848.
TurboTax does not support the 2848 form but it can be downloaded from the IRS site.
Form: https://www.irs.gov/pub/irs-pdf/f2848.pdf
Instructions: https://www.irs.gov/pub/irs-pdf/i2848.pdf
Per @macuser_22
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