Getting server error on password-change request

Hello. Currently i am creating application which needs to register new user with predefined password through Management API, then request for password reset link and send this link to user. Everything goes well until password reset.
My request in postman looks like

request headers

and response is

My full workflow:
Have my Management API:

For this API have application:

Request for acess token:

With this access token making request for create user:

Then with same access token and user_id from response making request for change password

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