Ignite Authentication - REST API ERROR in response

Question

{"successStatus":2,"error":"The user name or password is incorrect [userName=[testuser]]","sessionToken":null,"response":null}

Getting this REST API response on triggering authorization call for Ignite with following command:

curl "http://localhost:8080/ignite?cmd=version&ignite.login=[testuser]&ignite.password=[password]"

I have already created this user via sqlline interface of ignite with

create user "testuser" with PASSWORD 'password';

this command. Authentication is enabled in my cluster configuration file. Please tell me how I can get rid of this error, where I have mistaken or missed any step.

Thank you in advance.