Unable to Add Workers to Bahrain or Hong Kong Regions

When adding a worker instance to the Bahrain or Hong Kong regions, the following error occurs:

AWS was not able to validate the provided access credentials.

To add a worker to the Bahrain or Hong Kong regions, do the following:

1. Open the IAM Console.
2. Go to Account Settings > Security Token Service (STS).
3. Set the Global endpoint to Valid for all AWS regions.

For more information about AWS Security Token Service, see this Amazon article.