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We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 of X4 Pharmaceuticals, Inc. of our report dated March 21, 2023 relating to the financial statements, which appears in X4 Pharmaceuticals, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2022. We also consent to the reference to us under the heading “Experts” in such Registration Statement.