This is also the understanding of marriage that is offered by the Gospel. For this reason, when it comes to blessings, the Church has the right and the duty to avoid any rite that might contradict this conviction or lead to confusion. Such is also the meaning of the Responsum of the Congregation for the Doctrine of the Faith, which states that the Church does not have the power to impart blessings on unions of persons of the same sex.

https://press.vatican.va/content/salastampa/it/bollettino/pubblico/2023/12/18/0901/01963.html#en