A Catholic wedding involving two individuals who publicly identify as transgender has triggered a canonical investigation in Argentina, with the Archbishop of Corrientes stating the union is null and will be annulled by decree.
The Archdiocese of Corrientes has opened a canonical investigation after initially permitting the ceremony, later stating that the marriage is null and will be formally annulled
thecatholicherald.com
Thing is, this is a marriage between a transman and a transwoman so, if you believe that a transman is really a woman and a transwoman is really a man, it's still a heterosexual marriage.