Update password

Hi, dear Keycloak support team.
I need to implement the “Update Password” feature on the Android side.
So when I set “Update Password” required user action from the Keycloak dashboard, the authentication response is 401 (bad request). Sure, it’s confusing, but it’s not the only problem.
I know there is the update password API, but for this request, I need an access token. So this is a real problem because I can’t get any token but to update my password I must set a token header.
Thanks in advance.