b) The declaration discusses how to bless a couple living in an irregular situation or with a partner of the same sex without giving a blessing to the union itself. However, what makes two people a couple is a specific kind of relationship, union, or status between them (whether by law or at the emotional level). As a consequence, it may be difficult to distinguish the blessing of a couple from blessing the union which forms the couple.
https://www.pillarcatholic.com/p/fiducia-supplicans-whos-saying-what