Getting error - The authorization header is malformed; the region 'us-east-1' is wrong; expecting 'ap-south-1' (Service: Amazon S3; Status Code: 400; Error Code: AuthorizationHeaderMalformed)

I'm trying to get region-wise buckets using getBucketLocation() method in AWS S3 SDK, for all the regions it returns proper outputs but for the region us-east-1 it throws the error.

Tried few solutions such as changing the bucket name, deleting the bucket etc. but still the error persists.