Managed Grafana accessing Timestream data source

Question

Hello,

I am having an issue where my Managed Grafana workspaces can not access my Timestream source.
I have followed all the steps in this guide: https://docs.aws.amazon.com/grafana/latest/userguide/Timestream-adding-AWS-config.html

The error I get is "RequestError: send request failed caused by: Post "https://query.timestream.ap-southeast-2.amazonaws.com/": dial tcp 3.104.252.170:443: i/o timeout"

I am in the ap-southeast-2 region (Sydney)

What steps can I take to troubleshoot the connection? Is there something that needs configuring in the IAM?
Thanks

Answer

Just to add some additional information.

I created an additional instance of the AWS Managed Grafana - I did not assign it to any VPC and it can see timestream with no issues. 
So it seems that the problem lies with having the service attached to a VPC. I can not find many docs on how to make this work. any ideas? The IP address it tried to reach changes so it's not like I can add it to an SG. I have added the Grafana to my VPC to allow access to my RDS

Managed Grafana accessing Timestream data source

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