CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement No. 333-296728 on Form S-6 of our report dated July 29, 2026, relating to the financial statement of FT 13123, comprising Preferred Income Portfolio, Series 136, one of the series constituting the FT Series, appearing in the Prospectus, which is a part of such Registration Statement, and to the reference to us under the heading “Experts” in such Prospectus.

/s/ DELOITTE & TOUCHE LLP

Chicago, Illinois

July 29, 2026