Env Variables set on Install/Build Steps, calling the function does not contain

[itsmarcojulio-2185 (Its.marco.f)]

Hi hi! I’m using a Go Serverless function on Vercel with env vars, and hitting an issue fetching them at runtime.

• The env var is set and shows up during build/install:

I have this open repository showing how and when we’re getting the variables.

api/index.go

Runtime log when hitting the endpoint:

2025/12/18 12:41:43 Failed to load environment variable: TEST_ENV_VAR is not set

Any pointers on why the env isn’t available at runtime (even though it’s present in build/install)?
Would be super appreciated!!

[eswan18]

I’m also experiencing environment variables (both those I set and Vercel system variables) not being set at runtime.

[pawlean (Pauline P. Narvas)]

What does your Environment Variables look like in your Project Settings?

[itsmarcojulio-2185 (Its.marco.f)]

Hi!