SavingsPlans: Credential should be scoped to a valid region

I am trying to List all available savings plan in my account using

var savingsPlans = new AWS.SavingsPlans({endpoint: 'savingsplans.amazonaws.com', region: region});
const listResponse: AWS.SavingsPlans.DescribeSavingsPlansResponse = await savingsPlans.describeSavingsPlans().promise();

But getting following error in some scenarios. In some scenarios, it is working fine. What could be the issue? Please help.

"error": {
        "message": "Credential should be scoped to a valid region, not 'us-west-2'. ",
        "code": "InvalidSignatureException",
        "time": "2022-03-04T09:47:56.535Z",
        "statusCode": 403,
        "retryable": false,
        "retryDelay": 97.23145392059766
    }

I am running above code for all regions in my account. Fore some regions, I am not getting any error. But for some regions I am getting error. For example: I am getting error for region ap-northeast-1 but I am not getting error for us-east-1 region.

When I run the same code with Go SDK, it is working for both regions. not sure what is wrong here.

This issue is solved when we use v3 aws-sdk version.

import { SavingsplansClient, DescribeSavingsPlansCommand } from "@aws-sdk/client-savingsplans";
 const savingsPlans = new SavingsplansClient();
 const command = new DescribeSavingsPlansCommand(})
 const listResponse = await savingsPlans.send(command);

Seems there are some issues in v2 for savings plans.