Can't get password auth working

I’m developing an application to manage applications and devices on ttn. However I’m sturggling to get authentication working. I’ve been reading the documentation on here. I’m following the section titled Requesting the access token. I believe I have followed it correctly however when I send a POST request to https://account.thethingsnetwork.org/api/v2/users/token with the json
{ 'grant_type': 'password', 'username': 'my_user', 'password': 'secure_password' }
the response I get is
{ 'code': 404, 'error': 'User with username token does not exist' }
I’m not sure why I’m getting the response because the documentation says the endpoint is /users/token

u’ve got the fix ? im facing the same problem