React nativ, aws-amplify storage, getting aws.cognito.identity-id - reactjs

Question

i am trying to get aws.cognito.identity-id with React-Native. After successeful sign-in i am getting CognitoUser, but storage variable is equal to [Function MemoryStorage], however with React in my web browser storage has some values. Code in React and React native exactly same.
Browser output:
...
storage: Storage
CognitoIdentityId-eu-central-1:...: "..."
CognitoIdentityServiceProvider.....LastAuthUser: "..."
CognitoIdentityServiceProvider.........accessToken: "..."
CognitoIdentityServiceProvider........clockDrift: "2"
...
Android device output:
...
"storage": [Function MemoryStorage],
...
Code
Amplify.configure({
...awsmobile
});
const client = new AWSAppSyncClient({
url: awsmobile.aws_appsync_graphqlEndpoint,
region: awsmobile.aws_appsync_region,
auth: {
type: AUTH_TYPE.AWS_IAM,
credentials: () => Auth.currentCredentials()
},
});
Auth.signIn(
'myemail#gmail.com',
'pass'
)
// .then(user => console.log('user',user))
.then(user => signInSuccess(user));
function getValueFromKey(myObject, string) {
const key = Object.keys(myObject).filter(k => k.includes(string));
return key.length ? myObject[key] : "";
}
function signInSuccess(user) {
console.log('another', user);
console.log(getValueFromKey(user.storage, 'aws.cognito.identity-id'))
}
export default class App extends React.Component {
render() {
return (
<Text>nice</Text>
);
}
}