How to get the correct access token

Hi,

I followed the doc to create the user - https://docs.readyplayer.me/ready-player-me/integration-guides/api-integration/quickstart

However, there is no token in the response.

So i tried to follow this doc to get the token in the response - https://docs.readyplayer.me/ready-player-me/api-reference/rest-api/auth/get-token

But when I use this token to make the call to list the asset or other APIs, it all returns 401 UnauthorizedError

Can anyone please help me on this? Really appreciate your time!