this is along with name, race and other demographic information
They don’t have a gender field, and it really feels like they are just reducing sex and gender down to “you are what you were assigned at birth”, and then hiding behind amorphous medical “reasons” as justification …
Had something similar happen when I made a new bank account. They asked me for my name (obviously) and my name at birth…
It’s probably just a standard workflow for them to prevent easier money laundering but they didn’t need any proof either…? It just felt very very strange