Grappling with matters of identity and the complicated experience of being human isn’t, of itself, the problem.  The follow-on transgressions, such as a willful action to deceive and undermine others’ beliefs based on false pretenses, are:

“Recently, the Committee on Canonical Affairs and Church Governance was made aware of instances where it had been discovered that a woman living under a transgendered identity had been unknowingly admitted to the seminary or to a house of formation of an institute of consecrated life,” said the memo.

The memo suggests DNA tests as a possibility, which puts a spotlight on the basic problem that people seeking to become priests shouldn’t be lying in order to do so.

One can hold various opinions about the Church’s beliefs, but it violates more than its teachings on sex to knowingly deceive about one’s stance.