AWS Cognito Error: 'identityPoolId' failed to satisfy constraint

I am new Cognito. I am trying to implement AWS Cognito using Lambda. This is the tutorial I am following.

AmazonCognitoIdentityClient client =
				new AmazonCognitoIdentityClient();
	GetOpenIdTokenForDeveloperIdentityRequest tokenRequest = new GetOpenIdTokenForDeveloperIdentityRequest();
	tokenRequest.setIdentityPoolId("us-east-1_XXXXXXX");

This is the pool Id that I am using in the setIdentityPoolId

This is the JUnit test

public class AuthenticateUser implements RequestHandler<Object, Object> {

@Override
public Object handleRequest(Object input, Context context) {
	
	AuthenticateUserResponse authenticateUserResponse = new AuthenticateUserResponse();
	@SuppressWarnings("unchecked")
	LinkedHashMap inputHashMap = (LinkedHashMap)input;
	User user = authenticateUser(inputHashMap);
    return null;
}

public User authenticateUser(LinkedHashMap input){
	User user = null;
	String userName = (String) input.get("userName");
	String passwordHash = (String) input.get("passwordHash");
	
	try {
		AmazonDynamoDBClient client = new AmazonDynamoDBClient();
		client.setRegion(Region.getRegion(Regions.US_EAST_1));
		DynamoDBMapper mapper = new DynamoDBMapper(client);
		user = mapper.load(User.class, userName);
		
		if(user != null){
			System.out.println("user found");
			if(user.getPasswordHash().equals(passwordHash)){
				System.out.println("user password matched");
				String openIdToken = getOpenIdToken(user.getUserId());
				user.setOpenIdToken(openIdToken);
				return user;
			} else {
				System.out.println("password unmatched");
			}
		} else {
			System.out.println("user not found");
		}
	} catch (Exception e) {
		System.out.println("Error: " + e.toString());
	}
	
	return user; 
}

This is the output

user found
user password matched

But I am getting the following error and hence, the return user statement is failing

1 validation error detected: Value 'us-east-1_XXXXXX' at 'identityPoolId' 
failed to satisfy constraint: Member must satisfy regular expression pattern: [\w-]+:[0-9a-f-]+ 
(Service: AmazonCognitoIdentity; Status Code: 400; Error Code: ValidationException; 

You are using a Cognito user pool id as the identity pool id. They are two different things. Identity pool ids are of format us-east-1:XXXX-XXXXXX-XXXX-XXXX.

To get an identity pool id you should use the "Manage Federated Identities" parts of the Cognito console not the "Manage User Pools" section. Hope this helps.

Just a note: you can also find the correct user pool app client id in your project's aws-exports.js. The property name is "aws_user_pools_web_client_id"

You can find it in User Pools > Federated Identities > App clients > App client id