Amazon Grafana creat Workspaces iam in Cross-region

"I am an AWS administrator account. When creating a workspace, I chose IAM in Hong Kong, and Amazon Grafana is in Tokyo. I encountered an error:

The security token included in the request is invalid (Service: AWSSingleSignOn; Status Code: 400; Error Code: UnrecognizedClientException; Request ID: f163d9f5-043b-4316-91db-ed8d3f753be8; Proxy: null)

I have checked that IAM is enabled in all regions and has the necessary permissions."