If it doesn't, choose the other or closest option. It's unlikely there isn't one.
> there are places where IDs allow for more than those two options.
Sure, like here in NYC. That's really more of a personality thing IMO, which gets conflated with sex. Wherever necessary, things still reduce down to a binary choice, with the rest being details.
I'll retract that 'generally' then, and substitute it with 'always', since that's a mathematical certainty. There won't be any humans that are perfectly balanced with a completely equal distribution of all traits that we assign to one of the binary choices. Barring that, someone will always fall on one side.
Sure, though, we have the tech and ability to handle more than two, but until we get to the point where that's the norm not every situation where we don't isn't one where the sky falling.
You likely still identify as masc or femme in some sense, so chose the closest option.
My point is simply that there is likely a 'closest option'. Obviously people don't have to use any service they feel doesn't cater to them, but when a service doesn't always offer more than the binary it doesn't have to always be a "woe is me, how could I ever proceed" scenario.
Not only could that not match your real gender, there are places where IDs allow for more than those two options.
https://www.bustle.com/p/12-states-with-a-third-gender-optio...