I’ll raise a ticket about this also. We have run into what seems like a showstopper of a problem, at least for us. New regions are being provisioned with session tokens v2 and this breaks our aws.Provider() with the following errors:

Error: failed to refresh cached credentials, operation error STS: AssumeRole, failed to sign request: failed to retrieve credentials:

raise invoke_error
    Exception: invoke of aws:index/getCallerIdentity:getCallerIdentity failed: invocation of aws:index/getCallerIdentity:getCallerIdentity returned an error: 1 error occurred:
    	* error configuring Terraform AWS Provider: no valid credential sources for Terraform AWS Provider found.

I know there is a newer aws_native library which may fix this, we’re not using that. How do we use new regions?