---
title: "Discussion on \"How to Fix FCM \"MismatchSenderId\" in Multi-Environment Expo (EAS) Builds\" | Hashnode"
description: "Discussion on \"How to Fix FCM \"MismatchSenderId\" in Multi-Environment Expo (EAS) Builds\". Learn why multi-environment Expo EAS builds throw the FCM MismatchSenderId error and how to structure a clean project split or backend fix."
url: "https://hashnode.com/posts/how-to-fix-fcm-mismatchsenderid-in-multi-environment-expo-eas-builds/6a3f91d18b7cf69e3926f229"
---

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Discussion

# [How to Fix FCM "MismatchSenderId" in Multi-Environment Expo (EAS) Builds](https://astasilva.hashnode.dev/how-to-fix-fcm-mismatchsenderid-in-multi-environment-expo-eas-builds?utm_source=hashnode&utm_medium=feed)

Learn why multi-environment Expo EAS builds throw the FCM MismatchSenderId error and how to structure a clean project split or backend fix.

Jun 27 · 4 min read · astasilva.hashnode.dev  
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-   [#react-native](https://hashnode.com/tag/react-native)
-   [#expo](https://hashnode.com/tag/expo)
-   [#firebase](https://hashnode.com/tag/firebase)
-   [#mobile-development](https://hashnode.com/tag/mobile-development)
-   [#android](https://hashnode.com/tag/android)

## Written by

[Asta Silva](https://hashnode.com/@astasilva)

@astasilva · Bucharest, Romania

  
[View profile](https://hashnode.com/@astasilva)

React Native and Firebase debugging, Android build issues, and practical developer tools.

I write about React Native, Firebase, Android debugging, and practical lessons from real build and App Check issues. Currently building small tools and resources around error diagnosis.

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