MICROFRONTENDS_MISSING_FALLBACK_ERROR

The MICROFRONTENDS_MISSING_FALLBACK_ERROR error occurs when a microfrontends request did not match any other deployments in the same environment, and no deployment could be found for the specified fallback.

Troubleshoot

In the Production environment, this error should not occur since every request is routed to the Production environment of mcirofrontends projects. Make sure that every project in the microfrontends group has a production deployment.

In non-Production environments, the fallback is configured in the Fallback Environment setting. Based on the configured option, check that every project has a deployment for that environment.

If the issue persists after checking that every project has a deployment in the configured Fallback Environment setting, please contact Vercel support to reach out to the team.

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Last updated on July 30, 2025