Found the problem.
Just need to add timestream to the aws-us-gov partition in endpoints.exs
In the services for…
"partition" => "aws-us-gov",
"partitionName" => "AWS GovCloud (US)",
add…
"ingest.timestream" => %{"endpoints" => %{"us-gov-west-1" => %{}}},
"query.timestream" => %{"endpoints" => %{"us-gov-west-1" => %{}}},
Then call
ExAws.Timestream.list_databases() |> ExAws.request(region: "us-gov-west-1")
to see your databases
