buildNumber not passed to FastLane?

I’m trying to submit a build to the App Store with the same version but incremented buildNumber (which is set in app.json and visible in the build summary on I submit the build using

eas build --platform ios --profile production --non-interactive --auto-submit --wait

but this fails with the error

You've already submitted this version of the app.
Versions are identified by Build Numbers (expo.ios.buildNumber in app.json).
If you're submitting an Expo project built with EAS Build, increment the build number in app.json and build the project again

Looking at the submission log, it seems the buildNumber is not being passed to Fastlane which is submitting with buildNumber “1”:

Any ideas what I’m doing wrong?

I’m using:

  • Managed workflow
  • eas-cli/0.38.3 darwin-x64 node-v16.11.1

Is the any additional information I can provide to help diagnose the problem?

create a reproducible example and share it. also refer to Troubleshooting build errors and crashes - Expo Documentation

I think I figured out where things are going wrong -

My config is dynamic, using an environment variable in app.config.json:

export default ({ config }) => {
  const cfg = ({
    ios: {
      buildNumber: process.env.GITHUB_RUN_NUMBER
  console.log("Dynamic Config:", cfg);
  return cfg;

eas build uses the dynamic config correctly and generates a build with buildNumber set to my GITHUB_RUN_NUMBER env var, however the submission step does not, presumably because it’s happening on expo servers where the env var does not exist.

If I disable auto-submit and run the submission manually from my local machine it also fails:

GITHUB_RUN_NUMBER=10 eas submit --platform ios

So, I’m not sure if this is a bug, but it does seem like we’re unable to configure submissions dynamically in the same way as a build.