---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/52117#article
headline: "52117: Deprecated GCM/FCM API is used to send notifications"
url: https://www.twilio.com/docs/api/errors/52117
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 52117: Deprecated GCM/FCM API is used to send notifications

Log Type: APPLICATION

Log Level: ERROR

## Description

Google has deprecated the legacy FCM API in June 2024: https://help.twilio.com/articles/20768292997147-Updating-Twilio-Push-for-FCM-HTTP-v1-API

### Possible causes

Detected the use of a legacy FCM server key credential. This credential has stopped working after Google has deprecated the legacy FCM API in June 2024. Your action is required in order for FCM push notifications to continue to work as the legacy FCM API is deprecated.

### Possible solutions

Use a new FCMv1 credential to keep sending push notifications. See instructions linked in the description above.