How did you go about asking them? Did you send them an email before school started or did you do it in person at the beginning of school?
i sent an email. i just kinda made a template of what my email was and took out my info to where you could put in your own info. i hope this helps.
anybody can use this template if you would like :)
Dear (principal, guidance counselor(s), teachers if you want [i sent my email to my principal and guidance counselors and they took it from there and shared it with all the staff with my permission of course]),
My name is (preferred name), and I will be attending the (school district, campus, whatever type of school you will be attending) for my (grade: freshman, sophomore, junior, senior) year. I am an (FTM [Female to male], MTF [Male to Female] transgender, non-binary, etc. [you do not need to share your this “label” if you don’t want to] and have not yet legally changed my name. On your roster is my legal name, (legal name). I would greatly appreciate it if you and the teachers refer to me as (preferred name) and use the (preferred [he/him, she/her, they/them] pronouns) pronouns when referring to me. Thank you for your understanding, and I look forward to starting my (whatever grade [freshman, sophomore, junior, senior] you are going into) year as the person I really am.
~ (your preferred name)