Error when adding new Redshift data source

Hi,

I've hit an error which seem to be at odds with, well, itself.

I'm testing PBI integration with AWS Redshift. Redshift sits within a private VPC/Subnet so it's not publically accesible but according to documentation and PBI Gateway UI, this should be ok. All is working fine with Power BI desktop as I'm able to access the Redshift endpoint via a VPN connection. I can publish fine to my Workspace.

As per documentation from both Microsoft and AWS, I've followed the steps to add a Redshift data source to my PBI gateway. Specifically,

this: https://community.powerbi.com/t5/Service/Powerbi-Service-to-Amazon-Redshift-Private-cluster/td-p/963628

points to this: https://aws.amazon.com/blogs/big-data/integrate-power-bi-with-amazon-redshift-for-insights-and-analytics/

All works fine until the adding 'Applying' the new data source to the gateway. The following error is returned:

ODBC: ERROR [IM003] Specified driver could not be loaded due to system error 126: The specified module could not be found. (Simba Amazon Redshift ODBC Driver, C:\Program Files\On-premises data gateway\m\ODBC Drivers\Simba Amazon Redshift ODBC Driver\AmazonRedshiftODBC_sb64.dll).

Here's the odd bit. The file does exisit as I've installed the Simba Amazon Redshift driver. Any help would be appreciated