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No I was NOT referring to Form 8453-PE.

TT Business can be used to file for a Partnership on Form 1065, , and the signature form for that is 8453-PE (P as in partnership).  This worked for me for 2023; state was WI.

TT Bus can also be used to file for a trust, or estate, or a fiduciary, on Form 1041, and the signature for that is on 8453-FE  (F  as in Fiduciary).  This does NOT WORK.