What are the references that AVEVA Intouch 2023 R2 support 3-nodes High Availability Cluster on vSphere?

Hi,

Is the information available using the Technology matrix sufficient for you?

This is usually where you find information on any official support, to request additional info for specific scenarios and get any other official statement I believe you have to go through techsupport.

https://gcsresource.aveva.com/TechnologyMatrix/Report/Details/17198