In my experience, there can be very strong views on this question from people who identify as enby and/or trans. I always defer to what the enby person I am interacting with prefers identifies as, but know that what is good for the goose isn’t always good for the gander. I’d always suggest asking the person you’re referring to about how they personally identify, but I have had almost zero reason to ever ask. Pronouns are usually enough for day to day interactions and friends/family have always just volunteered without me asking (they’d give different responses to your question, by the way).

Edit: suggested to me that “prefer” sounds suggestive. How someone identifies isn’t a preference but a fact. Crossed out in original to show what changed, and I was assured it’s nitpicky but nice to not use prefer 😊