As far as I can tell, there is no official church stance outside of the fact that sex reassignment surgery results in a disciplinary council. And that's something that a significant majority of transgender people pass on anyway. I suppose one could argue that the Proclamation suggests that transgender people must be confused since gender is eternal, but plenty of transgender people would assert that the young children who already know they have a body that doesn't reflect who they are is evidence that gender is eternal, but that bodies don't always match. The Proclamation is vague enough to allow for a lot of interpretations.When this acquaintance of mine started wondering about their gender, they asked me about the Church's stance, I explained and encouraged them to pray for themselves.
Other than that, stories are all across the board. Some transgender Mormons report being ostracized and facing disciplinary councils for "cross-dressing" or taking hormones. Others continue attending their wards and filling callings, and some even attend the temple (as their birth sex) despite living as their true gender and using hormones. Perhaps I have just been unsuccessful at finding the Church's actual stance and that stance is being extremely unevenly applied, but I'm curious. Zedability, can you enlighten me beyond that? What did you tell him, and what do you have a testimony of when it comes to transgender people?