As the document makes clear, this practice could only be carried out in a way that upholds the church’s perennial teaching on the nature of marriage, which comes from the Gospel (FS 5)
(...) what it envisions are informal pastoral blessings for people encountering God and seeking his help and grace in situations in which “there is no intention to legitimize anything, but rather to open one’s life to God, to ask for his help to live better, and also to invoke the Holy Spirit so that the values of the Gospel may be lived with greater faithfulness” (40).
https://dioceseduluth.org/news/statement-from-bishop-daniel-felton-on-fiducia-supplicans