Can’t use the plugin with password protected site

Hi, I’m using the Wpengine server with protected site by user and password. But I could’t get a token using a login for the server, and sending a login for api. Something like this:

https://username:[email protected]/wp-json/jwt-auth/v1/token/

I got this message:

{
  "code": "jwt_auth_bad_auth_header",
  "message": "Authorization header malformed.",
  "data": {
    "status": 403
  }
}

I believe both methods check the authorization in header, so always get it as malformed.

If is possible to keep a way for both workning will be good for development in final environment.