---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/52102#article
headline: "52102: Invalid GCM/FCM registration token"
url: https://www.twilio.com/docs/api/errors/52102
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 52102: Invalid GCM/FCM registration token

Log Level: ERROR

## Description

### Possible causes

* Invalid GCM/FCM registration token provided via the Android SDK or the REST API.

### Possible solutions

* Make sure you do not modify the registration token before providing it to Twilio via the SDK or the REST API.
* If you are using a command line tool to provide the registration token, make sure that it is URL-encoded.