Your transition status and transition history should absolutely be considered protected medical information, by the way.
Legally and in practice, this is spotty, especially now that world-famous authors (cough JK Rowling) can apparently personally post upskirt pics of trans women's genitals on Twitter with absolutely no consequences (source. also by the way in my state (US), JK Rowling's tweet is legally revenge porn)
The direction you're trans in is also something that should be considered protected medical information, because unless you're intersex (and also for a great many people who are intersex), telling someone your gender assigned at birth is, by definition, also giving them information about the history of your genitals
You are never required to tell any of these things to anyone.
I don't care who demands it.
No one is ever entitled to information on the state of your genitals but you, especially as persecution of trans people intensifies in many jurisdictions
It is true that without this information, some people (especially other trans people) won't listen to you on certain subjects, or will weight what you say less strongly. It is true that some groups require this disclosure as a condition of membership or entering a space.
That's genuinely each person's decision to make, and it is incredibly context-dependent and trust-dependent.
But no one ever gets to force you to disclose that information, ever.
Because anything that refers to a person's transition status, genital status, transition history, or genital history is absolutely highly sensitive protective health information, and fuck any laws or jurisdictions that say otherwise
Anyway, you don't owe random people on the internet any information about you ever, all of this includes nonbinary people and any other people who aren't cisgender, etc. Peace and love on planet trans - please stay safe, and please, please stay alive <3