Anyone seeking or justifying the blessing Of an irregular or illicit union based on 'Fiducia Supplicans' would be looking in the wrong place. Anyone seeking a stamp of approval for their life or lifestyle must look elsewhere too. Blessings imparted are meant to change and transform us and not God or His opinion about us. The same goes for Church teaching. Jesus Christ is the same yesterday, today and forever.
https://files.ecatholic.com/30560/documents/2023/12/Bishop%20Brennans%20Statement%20on%20Fiducia%20Supplicans.pdf