TLS and node.js?

I’m currently running IIS as a proxy in front of SonarQube (documentation was really good btw). I have it setup for TLS using a certificate issued by our internal CA.

I call SQ from our on prem Azure DevOps pipeline - and while I can get to SQ via the web, I get this error during the build (which may be related to node.js)

[SQ] API GET ‘/api/server/version’ failed, error was: {“code”:“UNABLE_TO_VERIFY_LEAF_SIGNATURE”}

Anyone have a workaround?