AWS region locked account causes credentials test to fail

Hello!

I have an IAM User that can only be accessed from us-east and us-west regions. Due to this when I click the "Test and Use these Credentials" button I get the following error:

```
Error: The credentials you have entered could not be validated.

ERROR Details: Authentication with cloud provider failed: CloudBridgeBaseException: An error occurred (UnauthorizedOperation) when calling the DescribeKeyPairs operation: You are not authorized to perform this operation. from exception type:
```

After following up with IT this is due to the "Test Credentials" being called against the `ap-northeast` region instead of one of the `us` regions.

Is there any way to change where the test is called from or a way to override the test?

Thank you very much!
Robert