Note
Seethis comment for the latest troubleshooting information and fixes.

VS Code uses a version of Electron that does not support registering self-signed intermediate certificates with extensions on Windows. This unfortunately blocks our ability to perform HTTPS requests securely to a Coder deployment with self-signed certificates.

Seeelectron/electron#38527 for updates an information. We'll fix this as soon as we can!

Warning
"unable to verify the first certificate" is the error message you'll see.